The kind that thinks communism is the same as nazism and thinks communism is when the government does things.
I hate liberal brain worms.
They seriously do as much damage to the left as fascists by punching to the left and spreading capitalist anti-left propaganda. They overall weaken leftism and help fascism.
We need more left unity, folks. Fash ain't gonna bash themselves. 
If you’re safe and comfortable to do, call their asses out. It’s a lot harder to do in-person, but I think it’s still worth it. You’re probably not going to change their minds but you’ll likely make their cognitive dissonance deepen a little more, and anyone else within earshot will hear a good opinion for once