They ain't slick as to what actually angers them about RLM. But to be fair that clip of Rich Evans doing the Chinese impression was actually
this isn't a situation where on the regular they're discussing the chinese market for the film and rich pops in every time to say "oooooh me speekee chinee honorable sir prease"
they all literally just got done watching a man speak to them in a language they couldn't understand for an hour
and following up with "what, they talk like that" is an obvious caricature, he doesn't mean it literally
it's a Norm MacDonald sort of take, "I love all people whether they're queers or normal," being intentionally offensive