Have you ever had someone in your martial art class you didnt like?

I do brazillian jiu jitsu, and at my last class this kid my age named trever showed up...ive been taking jiu jitsu for a month and a half now and never seen him in class so i figured he was new? Well nope hes a white belt 2nd stripe. (Like me) so im like what. And this guy he goes to my highschool and i dont like him at all...most people at school dont either..cuz hes gross and not very polite. Am i just being shallow?!?! By the way im a girl. Have you guys ever had someone in your MA class you didnt like? How did you deal with it?