ProleWiki has a pretty detailed explainer: https://en.prolewiki.org/wiki/Patriotic_socialism

In short, it is a strain of opportunistic self-promoting hacks who argue the socialist movement needs to embrace the iconography and national mythology of the United States. They generally are very poorly educated about both history and theory. This doesn't stop them from mining for quotes to torture though. Haz, Caleb Maupin, and Jackson Hinkel are examples.

Their ideology changes like the weather, and they alternate between calling themselves "Patriotic Socialists," "MAGA Communists," and other nakedly ridiculous things.