Communist and socialist (by name) regimes in South America have caused more trouble for their own citizens than any leftist (by name) regime has caused for the world of capital. I don't think those posters necessarily absorbed that opinion from the US, in fact I think the US absorbed a lot of its own anticommunism from refugees. Historically it has been the business community advocating for détente and trade.
Tell me, who grew up in socialism, under communists rule, why this hatred is "stupid and weird"
“let’s try it one more time!”
Of course, what we need to acknowledge is that this shit is complicated and there's nobody that's one thing. There're no purely free market Capitalist nations because that would lead to crimes against humanity beyond our comprehension. There're also no fully communist nations anymore - when there were, they lead to crimes against humanity beyond our comprehension.
Everyone, everywhere, has a mixed system. Whereby the public sector exists, operates, and owns some stuff. Some public sectors own more than others. Those that own, say, education and healthcare SEEM to be doing better than those that don't. Their citizens are healthier, more educated, and seem to be doing better overall.
Another part of it is that the "international" section of our media is just about regurgitating whatever they say at CNN, FOX or whatever they have there, so the information almost always is arriving already biased (for example, they made here a big deal about the mishap of Biden's mental block at that debate, but they have never mentioned all the links between Trump and Epstein). Though I'd concede the phenomenon has aggravated due to social media, our hiperconnected reality and the increased amount of people moving there, legally or not.