Hulk vs She-Hulk

Sebastien is very much into Superheroes and comic books right now. I don't mind when he wants me to make pretend play that he is Spiderman and I am Spidergirl. I don't even mind when I have to play Ironman or Captain America... after all I am raising a boy. What I do mind lately is that he wants me to be She-Hulk. Pretending to be She-Hulk and being called She-Hulk at home is not such a big deal. It is when Sebastien decides that for the entire afternoon running errands...he is going to call me She-Hulk. He thinks it is great when we pretend in the middle of Publix. If I don't answer to the name She-Hulk (which I try often not to do in public) he just yells "Your not Mommy, your She-Hulk!", even louder. Instead of being the green She-Hulk in Publix, I have become the very embarrassed, slightly pink in the cheeks , She-Hulk.