What do you think of a guy listening to JoJo, Natasha Bedingfield, Trance music, Pop music,etc...gay?

My brother listens to JoJo, Natasha Bedingfield, a bunch of trance & pop music..........he hates rock/metal..etc. do you think he's gay? I think he is. He used to listen to Backstreet Boys. (YUCK)