Star Grinch wrote "but that doesn't change the fact that the episode gives the general perception of racial stereotyping. "
No, the problem is that it plays into pre-existing racial sterotypes.
Of course the ep could have been done with all whites, (or all Asians, for that matter, and that would have been about the same). But you had to have a cast that would regard Tasha as "exotic" in order for it to work.
If it means anything, I was struck at first viewing by the whole racial aspect of the episode and generally skipped it on re-viewing TNG. (Of course, the fact that the episode blew on any number of levels factored into that decision too.)
As an aside I always found it not credible how many alien species seemed to have the same racial sub-types as humanity. It wasn't until ENT introduced the "Aenar" (sp?) with its albino Andorians that we even got a hint that this situation could be an issue in other species not similar to humanity in the distribution of whites, blacks and Asian analogs.