>>718784929
Because a man making those expressions and movements clicks in your mind as atypical, ergo, unnatural behavior. Especially the dancing. Those movements are obviously meant for a female performer (see: the lean forward chest shake)
>it looks like a man
>but it doesnt move or behave like one
It kicks in your sense of uncanny valley. Its easier for you brain to assume this was artificially superimposed than to think a man could or would move like that.
Unironically, stand infront of a mirror and try to move like that. You will find it difficult to the point of unbelievable.