These protests are mostly against the rule of the SDF and the lack of services like water supply.
In Abu Naytal, a village on the Khabur with many IS supporters that is making problems since months, there tensions occured as well.
Protests in Suwaydan (another town where IS lately ambushed and killed SDF members) targeted SDF for theft in the local shops and accused them of killing a young man.
Residents accused Asayish of killing a member of the DMC, when they searched his house in charges of theft.
Now, a few thoughts from my side, beginning with the last incident. I think there it is possible that the DMC member was armed and probably attacked the Asayish members that were trying to search his house.
And now on the more general thoughts:
When YPG is too present in the area, they scream bloody murder about Kurdish occupation. On the other hand, when SDF leaves responsibility to DMC, tribal units loot in in other tribal areas bc of feuds
This occured many times and no matter what SDF does, they do it wrong.
This is one of the problems of this tribalist, and yes, racist, landscape.
The protests against SDF mainly criticize lacking services and actions like arrests.
There are already many casualties among SDF.
There are other Arab areas like the ones inhabited by Shammar that don't have this problems, as there is cooperation with SDF and a staunch enmity towards the IS.
The question is, how many are willing to do this?