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. 
Depends on the individual. I think for some, it's just another step of their radicalization.
It took repeated instances of reality being a battering ram against my own liberal delusions until I finally became a "tankie", until I finally realized that the system is unfixable and "civil debate" will get us nowhere.
This was my evolution as well. From “idk if I should go on r/cth, I hear they’re tankies” to having a remembrance of Stalin during intercourse.