Comment by bluGill

A lot of parents are choosing a public school because it's doing the equivalent of that as well. Private schools can select out the undesirable students, but so long as there's only a few of those your life is better for meeting the undesirable people in the world.

Undesirable is of course is to find different by different people. The larger point is so long as the undesirable people are not overwhelming the school and bringing you down, it's actually good to meet them. Maybe you'll bring them up, but even if you don't, it helps to broaden your viewpoint of the world and helps you to not become a bigot.