I don't think they're just missing the point; rather, their entire worldview and politics center on insisting that it does not exist. There's this idea that's been fairly widespread for a while that whatever views are held by extremely online left-wingers today are simply the correct, non-bigoted ones, and that the only reason that anyone would want to even give a label to them, let alone debate or challenge them, is to defend bigotry. (Not only that, if tomorrow or in a week or month or year those people change their view of the world, then those are simply the correct views and always have been.) The idea that this in itself is a form of bias, or that it gives power to a particular group of people who could be wrong, just is not within the accceptable range of thought.