The poster didn't complain about a bias. They complained about a perceived demographic composition.
Detroit is too black. Vancouver has too many Indians.
How do those sound? There is no difference between what the poster said and those statements, beyond the common acceptance that you can be racist against whites, even if just attacking the imaginary demographic of a group.
I believe that, technically, the term would be "discriminatory" in this case, white people being in a position of relative power and privilege in the West (and most of the world, really. White people are esteemed all over, even if just in relation to other foreigners).
But it just isn't the same as you said. The difference here is that this is a question-and-answers forum, and the lack of diversity, as in the homogeneity of values and experiences, might be indeed undesirable.
Though I wasn't able to quickly find an study that showed that homogeneity begets groupthink...
Detroit is too black. Vancouver has too many Indians.
How do those sound? There is no difference between what the poster said and those statements, beyond the common acceptance that you can be racist against whites, even if just attacking the imaginary demographic of a group.