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People who misuse and abuse labels. Some people are so pc they object entirely to the use of labels, which is wrong (labels are like stereotypes... They aren't always true, but there's usually something true in them, otherwise they wouldn't exist); other people use labels as an excuse for their bad behavior and/or mistreating other people. Other people are so mentally constipated that they can't see potential beyond labels, which they perceive to be concrete instead of variable. Labels are for description, not restriction, people.