I lost all respect for my boss because I found out he watches anime.
You lost respect for someone because of their tv choices?
Yeah... My boss is turning into something else. He is becoming weird.
A lot of people are into anime. You would be surprised at the number of people that enjoy it. You should not dislike them based solely on that.
I still show him respect because he's my boss, but secretly I have no respect for him.
It's good that you at least still treat him with respect. You really shouldn't judge someone for something as meaningless as their TV preferences. Everyone likes different things and you should be accepting of that.