You mean in rap specifically? As in, their are those that think rap is all about multies, or all about beats, etc?
Yep, that argument can definitely be applied to any aspect of rap music. Criticizing that attitude applies to anyone that makes a sweeping statement or attitude about the genre and who's superior based on a single aspect of the music, this is true.
The "emotionalz is better" bit is more ubiquitous though, right now especially. That's why it was brought up. Two years ago on this site, all people talked about were multis, and this thread would have happened then with the same type of discussion going on, with "being emotional" substituted with "mindless multies".
It goes further than that, but I think that's the most direct way to address your question.