Reporter: Pink may not have started this fight. But she was quick to hit back. When twitter fans started criticizing her over these pictures, showing her husband, motorcycle champion, carey hart,... See More
Reporter: Pink may not have started this fight. But she was quick to hit back. When twitter fans started criticizing her over these pictures, showing her husband, motorcycle champion, carey hart, taking their daughter, willow, for a ride on his motorcycle. The toddler in pink ear muffs. But no helmet in sight. Causing one fan to tweet, let until she's 16 and let her decide for herself. Bikes are no joke. To which the pop star responds, if any of you had more experience on a bike than my husband, I will listen to your opinions. I can't promise I will care. But I will listen, nonetheless. Pink's reaction, whether you agree with it or not, was very normal. No mom wants to be criticized about the way they parent. When people see a child and they think she may be in danger, they're going to step up. They're going to say something. Reporter: Then, the grammy winner gets down and dirty, addressing each critic directly. Retweeting this message from a fan. I wouldn't like the idea of a child so young being on a bike. Pink responding, then, I don't recommend it for your child. It's certainly up to pink and her husband to decide whether or not they want their child to wear a motorcycle el met. But as public figures, they should know you're going to take heat or it and not respond so aggressively. ♪ No one breaks my heart like you ♪ Reporter: At one point, the pop star even tweeting, this is fun. Before delivering a final sarcastic blow. Okay. I'm going to go now. Got to fig unite you what wills is wearing tomorrow for her maniacal moto mania. For "good morning america," linzie janis, abc news, new york.
This transcript has been automatically generated and may not be 100% accurate.