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. 
I don't have anything to do with them, partly out of distaste, but also because I do think they pose a potential threat of getting real leftists Rosa'd. They strongly prefer fascism to the so-called "red fascism" of the dreaded tankies. There's not much value in trying to make community with them, mostly just the risk of being fucked over by a bunch of shit-libs masquerading as socialists.
In some ways it's easier to engage with self-identified liberals than it is with the liberals that decided to call themselves leftists.