It's likely because of him being the usual... I can't say manwhore exactly since he only does it with one person (so far).
Well that + the bit of a cocky face and a slight dickwad first impression. Combination of all of those doesn't really make his appearance in the first two chapters very appealing aside from his model.
Personally, I don't really care. Saw too much of those even in normal sports web comics. ╮( ̄▽ ̄)╭
I just hope it doesn't continue with sexual assault "like usual".

Why is everyone hating the top? I think him getting hard from the Uke crying was a bit meh usual plot in many bls, but him playing 1 on 1 and telling him where he needs to improve makes him an asshole? Sometimes the truth helps others to improve!!