HM. Not really. I think he has a relatively positive feeling on Hibari in canon anyway. Not like . . . "yes I like him" or "we're friends" sort of thing but Hibari is a force to be reckoned with and there's no real buying into that mafia shit. I guess it is more "I don't think Mukuro actively dislikes Hibari in canon" than anything. And he feels similarly in Aather. And he can't help wanting to poke a little :x It's just in his nature.

'x' do you like me hibari!!1