yeah america has a really bad history with socialism because of its class structure and it's made socialism really wobbly here as a result.

through its history american socialists have done a loooooot of things that are outside what we would conventionally recognize as the conduct of socialists. They've been really opportunistic and much more concerned for advancing the cause of their own careers and material interests than that of socialism or proletarians. Some have even engaged in some really reactionary stuff, for example the chinese cigar strikes and calls by white socialists in california to lynch and push out chinese workers so white workers could take their jobs and tons of others.

Part of this has to do with the separation along racial lines, it wasn't until the mid 19th century that america really had what could be considered a white proletariat (imported from europe during industrialization) for much of its history before hand it used black slaves, indigenous people, and chinese and mexicans in the west to act as the prole base of society which allowed even lower class whites a great deal more social mobility off the backs of bipoc workers, so a lot this stuff is heavily confused here. There's a lot of uninterrogated chauvinism in, particularly, white american leftists. And also of course in the last 100+ years a lot of propaganda and red scare stuff muddying things in general.

I don't necessarily think that anti-americanism is an inherently bad thing, after all they (the govt) are and have been the biggest obstacle/impediment to socialist movements in history but yea in general the american left has been really bad on this front and definitely needs to improve.