"I was mad," Rose said. "I'm sick and tired of people trying to take cheap shots at me. You got to say something."..."He didn't even aim for the ball. At least go for the ball. I felt like he didn't and that's the reason why I got mad a little bit."
Rose isn't sure why he feels like some players go after him.
"I really don't know," he said. "Probably because I don't say anything or whatever, but I'm a man, where in situations like that you have to say something."
As Nick Friedell notes in that post, this is the second time this season the usually-demure Rose has questioned opponents' physicality towards him and the referees' handling of it. The first incident earned him a fine.
Of course, the problem with this particular case is that it likely shouldn't have been ruled a flagrant, as the foul was hard but not cheap. I can't find any video if it currently, but Villanueva looked to be making a play for the ball. No doubt Rose himself has seen worse in terms of intent, and maybe it was just the result (the busted-up nose) that made this particular play seem worth the call-out.
Detroit Bad Boys has a bit of fun with Rose's comments: they note that Rose DID get the superstar treatment, and Villanueva possibly being punished for his own dirty reputation, not only with that flagrant ruling but the technical assessed afterwards.
Kurt Helin at ProBasketballTalk suggests that Rose needs to get used to that kind of contact now that Rose is a superstar. I'd argue he has gotten used to that, but now he's doing what the other greats do: complain about it to get more benefit like he did on Sunday. I guess Rose really is maturing!