It’s really a poster based issue if at all, not a race based nor colour based one. Both of those nationalities, you mention, and many others, have posters that are decent enough here, and for the most, one tends not to even reflect upon the nationality. I’ve often found profiles on the forum to be native from a non-english speaking country, and that fact brings additional value to the character behind the profile.

On the other hand, spam type posters may be mocked at some point (it’s not a norm, nor a necessary constant). Those tend to have less command of the English language, and are prone to putting little to no effort into their posts. It’s pretty irrelevant who is behind that sort of post (colour, creed, and so forth).