Oh dear. Well, that explains a lot. In my experience, most of these kinds of Communists think Assad is some kind of plucky underdog, rather than, you know, a dictator who inherited his rule from Daddy and decided torturing a bunch of kids to death and dropping their corpses off in the town square was the best way to deal with peaceful protests against his rule.
These same people tend to accuse everyone of opposing Assad of working with Al-Qaeda, ISIS, or both. Rather than, you know, Turkey, who was letting ISIS enter troop formations into their territory to wipe out the YPG on the border and buying ISIS oil.
Like, there are valid criticisms from the left to be made of the YPG. The way Arabs seem locked out of the political process and generally discriminated against, for one (though even these Arabs will concede the YPG are much better than Assad or the militias). There is torture going on, there are summary executions at times, the YPG definitely do not adhere to the Geneva Conventions, though their crimes are much closer to western norms than other actors in the region (less chemical weapons, suicide attacks and carpet bombing, more "we killed a bunch of people on dodgy intel or to send a message not to fuck with us").