yeah they are pissed at you because you are pinning them to "when push comes to shove", a phrase they only used once and which, once contested, they immediately, repeatedly clarified towards a more nuanced position talking about revolutionary context. In that light YOU are refusing to engage with their argument in a miserably pedantic, sniping way. It's a testament to their character that you got as much text out of them as you did before they gave up on you.

Even making the much more limited claim that “in a revolutionary context, social democrats are more likely to side with fascists than communists” runs into a fair amount of historical trouble.

This is a claim

For starters, many revolutionary contexts don’t fit neatly into fascism vs. communism.

This seems to be the beginning of you reinforcing that claim.

Fidel Castro didn’t hold himself out as a communist until months (if not years) after the Cuban Revolution, and when he did it was primarily because the U.S. had made its hostility clear. Ho Chi Minh famously modeled the Vietnamese Declaration of Independence after the American Declaration of Independence and sought an alliance with the U.S. after WWII. You have situations like Chile, where Allende’s government was better described as social democracy than communism. You have situations like Venezuela, where Chavismo isn’t exactly communism, and where the stooge backed by the U.S. is pretty close to social democracy. You have situations like Jamaica and Sierra Leone where a social democracy granted independence to former colonies in a situation where independence was popular but there was no movement worth calling a revolution.

This is basically a bulleted list of extremely different places with extremely different circumstances, linked vaguely under the umbrella of revolutionary action. You don't even use the words social democracy until you insinuate that Juan Guaido, a LITERAL CIA OPERATION, is somehow an example of how social democracy is NOT at least tentatively linked with fascism. It's trash.

YTA. fix your engagement style. Moreover, get over the part of yourself that gets frustrated to be argued against.