In Reed College, radical students intimidate teachers based on their "identity". This sort of bigotry becomes ludicrous when, as in Reed College, the students are factually mistaken about the people they label. But it's equally wrong when the labels are accurate. This form of bigotry is a part of the "political correctness" that some right-wing Americans resent.

There are much bigger patterns of bigotry in our society. Many studies have shown that blacks and women are systematically judged by a harsher standard than while males. To measure this bigotry, we have to classify people as bigotry does. Then we can institute measures to change the bigoted judgments.

That's where the classification should stop. To condemn speakers, to say their views should not be heard, because of labeling them is an injustice (which, as it happens, plays into the hands of right-wing bigots).