Guys respond differently to popular people. If you try to charm them and brag about it, they get annoyed, which usually results in an argument or worse.

[He still remembers back home bragging about his show up in the magazine and getting smacked in the back of the head with basketball by Aomine. He may look like an airhead but he learns.

As for the tastes, Kise is complicated. Enough so that he can't explain it. Tho he would get into an argument if anyone ever brought up the question of "why" he likes Midorima.]

So unless they bring it up first, I don't mention it. [Kise taps his chin,] I'll figure something out... [A promise from the social butterfly.]