Saying something negative about a fighter is perfectly fine. We do not tolerate it when professional fighters are being insulted, though, that's the difference.
Good: He does not act like a real man would, he is scared.
Bad: He acts like a -ussy, what a -itch he is.
Besides, it is important how much sense the "accusations" make since some guys talk trash only for the sake of talking trash without having a point.
Hope that helps.
