In my experience, most of these people are actually quite dumb and unable to even produce this kind of judgement consistently. They don't come up with it, they go to college, take a few years of gender studies, learn these slogans, then spew them out to the rest of the world.  In fact, even though they're constantly getting triggered at and finding problematic biases on everyday things, they'll often ask their counterparts in online communities if they're not being paranoid. You'd think they were getting better with experience, right? But the truth is that they're so stupid they actually become more and more unsure about their own triggers.