The gut-reaction to call someone cringe is a natural expression of the human desire to conform to social norms. They are insecure about their own differences so they enforce conformity in others by trying to humiliate them, the way they have been. In a strange way they could see it as helping them to avoid further humiliation. They're saying "cut it out" with an implied "or else people will not accept you." It's pure instinct.

No.

They've been inconveniencing me by following me around and harassing be because they didn't understand my simple point that 'they' applies to all humans.

They harassed me over calling Caillou 'he.' As in the cartoon toddler. Seriously.

They also object to people using the word 'you' to address them, which is fucking stupid.

If someone is so socially inept and surrounded by equally socially inept people who don't call out this behavior, then it's possible they don't have anyone who is part of society at large that would inform them of how their actions will be perceived by most members of the public.

I'm not commenting because it hurts me in any way. I'm commenting because this person is going to have a relatively difficult life socially if they continue with the behavior they currently exhibit.