Reporter: People who are overweight, too often their waistline becomes the punchline. Ha ha ha, it's funny because he's fat! Reporter: But every once in a while, even typically funny shows, like... See More
Reporter: People who are overweight, too often their waistline becomes the punchline. Ha ha ha, it's funny because he's fat! Reporter: But every once in a while, even typically funny shows, like "Louie," tackle the weight issue in a more serious and emotional way. I'm saying, have you ever dated a fat girl? Have you ever walked down the street in the light of day holding hands with a big girl like me? Do you mind if I get in here real quick before you get everything -- Reporter: In real life, what would you do if you saw an overweight person being discriminated against? You're at a buffet, it's not going to help your willpower. And you'll never be dating. You'll never have a guy like you -- because you're fat. Reporter: We've taken over the Wayne chateau buffet in new Jersey to see if anyone reacts when cruel comments target customers who are plus-sized. I Don't think you should be eating that many fries because you're fat. Will you save some food for everybody else, I mean it's your fourth plate. It's freaking disgusting. Reporter: Meet our actors. Abby will be playing our diner, while yuval and Traci are the rude customers. The reason you came here, to eat all you can? Um -- it's an all you can eat buffet, right? Right, but I would test your willpower. I'm just saying, you might want to be a little careful with what you choose. You're here too. Yeah, but I'm thinner. There's a difference. Reporter: This diner is clearly uncomfortable and offended by what she hears. Have Traci walk by. Traci continues her assault by serving up some dishes she thinks are healthier options. So this is the all you can eat you really should eat. That would really be good for you. I mean clearly, if you want to eat a lot, eat that one, okay? Wait a minute, get the manager over here. This is . Honestly, honestly, honestly. Can I help you? She just assaulted her. Who insulted whom? Her -- she brought this plate of food. Oooh, it couldn't be me. She came to the right one. What happened? We up there getting food. The lady came up to her and said to her "You shouldn't be getting fried food, you should be eating proper food." And she just came back and brought the lady this plate. Look at her! She's distraught! Reporter: Okay, we're going in. It really bothered you? Yeah, it really did. Because one thing I know about me, I know that I'm overweight and I have to lose the weight but it's intimidating. You're slim and I'm on the heavy side. Looks like you come here often. Excuse me? I'm just saying it looks like you come here often. I can tell by your size that you like a buffet. Wow, don't worry about it. Let it go in one ear and out the other. Okay, thank you. Reporter: After listening to yuval's evil words, Amanda Babcock goes over to talk to our actress. I wish my friend was here. She's 400 pounds and if she heard them saying one thing to somebody -- She would freak out? -- Who was a little bit bigger, she would deck him across the room. Reporter: But minutes later, he continues his taunts. Lady, seriously, it's like your fourth plate or something, isn't it? I don't even know you. Mind your own business. Well, you should stop eating so much. Rorter: This diner finds herself caught right in between it all. You know maybe, at least you have a salad on your plate. The rest of the stuff, I don't know. Are you serious? Why are you being so rude to her? Reporter: Angered by what they hear, this tough trio quickly come to Abby's aid. Why are you being so mean to her? She's just constantly -- That's none of your business! That's so rude! Are you serious? That's so rude of you, that's none of your business! I don't know who you think you are, but you should apologize to her right now. You should apologize to her right now. Why? I just don't think she should eat all the food. I don't think that's any of your business. Are you serious? Apologize to her, that's rude. What's rude about it? I just care about how much she's eating. I'm sorry, that's so rude of you. Oh, my god. Wow. Reporter: Even after Abby has walked away the customer continues fighting for her. You're skinny, so you can like, eat more. But that's not nice. That's none of your business if she's big or not. But I'm just trying to help her. But that's none of your business, like, oh my god. That's so rude. Reporter: Amanda is still there listening, and she's finally heard enough. It's none of your business what they do. Who cares? They're big girls, whoop-dee-do, who cares? Do they know you? Do you know them? Who the Are you? I'm just a customer, like everybody else. You're a customer, so is she! If she pays to eat here, she should not be harassed to eat here. Well, you know what, I think they shouldn't eat so much because I want to have like. There's food! There's food here, there's food here, there's food here, there's food here. Eat your Food and leave them alone. Are you Me? This is "What would you do?" Are you kidding me? Reporter: No, I'm not. Boy you were fired up. I'm fired up here! Reporter: Why is it important to step in for someone else like that? Because I don't think it's right. You're a big girl, you're a skinny girl, you eat what you want. You do what you want to do. Reporter: What was it that triggered your response? That he told them that they were fat and eating too much. And I stepped in and said, who the hell are you to tell them what they can and can't eat, they're paying here! Reporter: You told her, my best friend is -- 400 pounds. Someone would make fun of her weight, she'd knock them right in the face. Reporter: Sounds like you would, too. Yeah, I would, I would. Reporter: He's an actor. You were driving me crazy! Reporter: Hi, girls, I'm John Quinones. Boy, you were tough. You don't want to mess with us when we're hungry! Reporter: Your advice to someone who is victimized like this? Stand up for yourself. Honestly, or have these girls as your bodyguard, I don't go anywhere without them.
This transcript has been automatically generated and may not be 100% accurate.