He probably tries to "covertly" interrogate Chu Shuzhi about the kinds of things he's into, too, in such a clumsy way that everyone (except possibly Chu Shuzhi himself) knows exactly what's going on.

hahahahahahahahahahahahaha!!!!

That would make a great ficlet from someone else's POV! Lin Jing, maybe. Zhu Hong could be marginally impressed that he manages not to let on--or to laugh.