My default is something snide like "It's impressive that you were able to write all that when you clearly don't know how to read" and then block them. For bonus points, make a post in an unrelated community so people who look at your comment history can boost you.

Okay but phlebotomists are actually evil. It's the nurses that keep them from going too far. This is why I always take a wooden stake to my blood draw appointments.

Start by asking them to define their terms. "Belongs", "imperialism", and "fascism" are the ones I'd like to see definitions for. Though I've gotta admit that I'm not very clear on "fascism" these days, which seems to be a term with many meanings, depending on who is using it.

If someone's argument depends on a lack of logic, getting them to elaborate on it can make that obvious.

They'll probably avoid the question though because they aren't there in good faith.