New Noises = Funny Faces

I was making noises at Isaac this morning making him smile and found one that he doesn't find amusing at all. When I roll my tongue and make the sound go from low to high, he kinda freaks out a little. His face of disapproval started out as the biggest pouty lip I'd ever seen and turned into this: 

I have a video where he's making his face and then he starts crying. I should feel bad for him but instead, I think its funny. That doesn't make me a bad mom does it?