Seeing just how indiscriminately that epithet seems to be flung? (I've seen it applied to everyone from marginalized people calling blatant bigotry by its right name, to vegans claiming to be oppressed for being vegan, to obvious trolls--mostly on Tumblr--trying to make a punchline out of the first category. And trust me; I wish that last one weren't true.) It's a concept that exists for the express purpose of labeling one's opponent as a thin-skinned keyboard activist (and therefore irrelevant), thus absolving oneself of accountability for one's misdeeds.