Pink helmet

Sigh...
On my daily walk today I was ever so cheerful until I overheard two boys, about 8 years old talking to each other while cycling together with their fathers.

Boy 1: Look at his helmet! (referring to the other boy's dad)
Boy 2: What?
Boy 1: It's pink!!!
Boy 2 doesn't reply.
Boy 1: He's a girl! (laughing).

Their dads were talking to each other and didn't hear the boys. I wonder if they would have said anything if they heard them. And what they would have said.