I guarantee that no communist legitimately supports blue-collar workers

You can support the working class without supporting their religious or political beliefs

I don't think that's what the meme is saying. It seems to be more of an argument against elitism, which is often a product of communism

Yep.

As you can tell, it's not about religious or political beliefs. It's that socialists have never supported blue collar workers because they weren't born that way. This is why blue collar workers support right wing politics.