Transcript for What Would You Do: Child with Tourette's Syndrome is bullied
??? More, more, more ??? "What would you do?" Continues. Thank you. Reporter: This is Jillian's dream, hanging with a couple of friends -- fitting right in. But in our scenario, she's got more bullies than buddies. Can I please have -- ha! Ha! What's wrong with you? Why do you keep yelling? I have tourette's. Reporter: Tourette syndrome is a disorder that causes involuntary physical and vocal tics. You're hurting my ears. I can't control it! You must have like, zero friends! Reporter: If you saw a kid being bullied for having tourette syndrome. Oh, my god! Girl, you need help. Reporter: What would you do? Hidden cameras on. Reporter: Our cameras are rolling at mark and Julie's homemade ice cream in west Orange, New Jersey, as Jillian steps up to order. You know what you want? Ha. Can I please have the strawberry? What's wrong with you? Reporter: Right away, this man's eyes are glued to the scene. Ha, ha! What is that? Are you laughing? I'm not laughing. This is so funny. Ha ha! Wait, are you laughing at us? Listen, I have tourette's. What's that? What's tourette's? I can't control it. It's not funny. Hey guys, it's a pretty serious condition. It's involuntary. Do you know what that means? You shouldn't be making fun of her. Reporter: When they answer him with more hurtful comments, But she's weird, look at her! Reporter: He offers kindness. We're all weird. We're human beings. Don't make fun of her. Like, she can't control it. I'm sorry. It's not your fault. Why are you defending someone you don't even know? Because I'm a person with compassion. And I don't like it when people bully people or demean them for something that they aren't educated about. So the goal is to educate you guys so that in the future you'll know. Hey, I shouldn't be making fun of these people, but I should be helping them because maybe they'll be helping me in the future. Reporter: Time to meet this helpful man. Oh, snap! How are you? It's "What would you do?" I'm on TV? I got to get out of here. Reporter: Ah, come on! What was your message to those bullies? People got to speak up when bullying happens. Just say something. What if it was you? Reporter: In fact, Jillian is an actress who's grown up with tourette syndrome. She has experienced these very same tics in real life. Twice, come over and say hi. And she knows just how it feels to be bullied. Jillian, how did it make you feel when he spoke up? He's saying wonderful things like we're all weird, which we are, that was really great. Reporter: Throughout the day, there are lots of different flavors to how customers confront our bullies. You're a freak! She can't control it. If you start having hiccups, can you stop having hiccups? Reporter: He encourages our bullies to do their own research. This is a made up disease. It is not. Look it up. Do you guys have cell phones? Just look it up. Ashton, it's so funny. Ha. Okay, that's not funny. It's not the right thing to do. Reporter: This mom serves it up plain and simple. She's yelling. She's not yelling. She has a condition. She can't help it so, cut it out. Okay? Leave her alone. Have a little bit of respect. Reporter: And she believes that respect should be taught at home. I'm shaking I'm so upset. Reporter: You're a mother. I am a mother. And oh, my god, I would never allow my son to take a second look, laugh, anything, point a finger. Reporter: What would you say to parents whose kids are like this? Talk to your children. Teach them acceptance not ignorance and arrogance. Is this like your desperate cry for attention? Reporter: This girl, just a few years older than our actors, reacts with anger. Is this contagious? Were you born ignorant? Reporter: And she has no problem calling out our bullies. This is not a contagious condition. I don't think you should be mocking people for having it. Reporter: This woman comforts Jillian. That's not even a real disorder. It actually is. And she can't help it. Thank you very much. Some people just don't understand. Reporter: And then encourages her to focus on something positive. Did you get your ice cream already? Which flavor are getting? Cake batter. That's so awesome. You should have a muzzle or something. Ha! I just want to film this and put it on YouTube. But I don't want to ruin these people's lives. Reporter: Time to tell her. We've got the filming part covered. What were you going to do? Oh, my god, you're kidding me! I was so upset. I totally watch your show. Reporter: You're in tears. Yes, the explanation is my brother had vocal tics when I was growing up. And like, it was so upsetting. You know, children sometimes don't know better, and they don't understand the consequences of what they are saying. Hot fudge sundae, how many scoops do you put in it? Reporter: When this man hears a scoop of abuse being served to Jillian -- What's wrong with you? Uh, I have tourette's. I'm sorry. Nothing's wrong with her. Reporter: He tries to quickly shut it down. What's tourette's? Don't worry about it. I don't want to catch her disease. I have to worry. You're not going catch her disease. It's not a disease. She's fine. It's not contagious. Reporter: But when their words get meaner -- he gets more emphatic. You should be in a hospital. No, she should not. You don't know what you're talking about. And leave her alone. Stop doing that! Hey! There is nothing wrong with her. Leave her alone. It's not a disease. You don't know what you're talking about trust me. I cannot take it, it's way too much. Then leave. She's not doing anything wrong. Fine. We'll leave. Because she's making me feel uncomfortable. Bye, freak! Don't pay any attention to the stupidity. Thank you. There's nothing wrong with you. Those kids are completely rude and immature. I'm sorry. To you, it's distracting. Don't be sorry to me. I'm happy to do it. That's ridiculous and rude. I would love to see those kids' parents. Give me a break. Ridiculous. Reporter: Time for us to do just that. I'm John Quinones, with the TV show "What would you do?" Oh. Reporter: Wow, you were angry. Ridiculous there's nothing wrong with her. Reporter: You came over and patted her back. I wanted her to feel uncomfortable. She should not feel uncomfortable because of what she has. Thank you very much. Of course. "What would you do?" Will be back here next week. That's our program for tonight. Don't go anywhere.
This transcript has been automatically generated and may not be 100% accurate.