While this is true, I think it kind of understates the problem. The issue isn't just "a few vain people put too much emphasis on their superficial group identit

While this is true, I think it kind of understates the problem. The issue isn't just "a few vain people put too much emphasis on their superficial group identities", but rather they are part of a broader ideological contingent that puts tremendous emphasis on everyone's superficial group identities. These folks generally believe that these identities are useful bases for decision making (i.e., discrimination in the most literal sense of the term) because to know a person's superficial identities is to completely understand that person. It might be controversial to say (i.e., go ahead and take my Internet Points), but it seems to plainly run completely counter to the equality ideology that gave us the civil rights movement and popularized "tolerance" as a virtue.