His problem is he is a non-tolerant leftist (not alt-left but solid full swing left). That in and of itself isnt an issue if it werent for the non-tolerant part. Anyone who is slightly more left than him or slightly more right than him he has a fit, tells them off and tells them he is blocking them. Often random people he had no interaction with... given how narrow his acceptable views are this tends to be several people a day... Not surprisingly this just pisses a ton of people off getting random hate messages from random people they never even engaged with.
As I said its not strictly against the rules so I never banned him for that... But its unlikely any server that actually fits the sort of environment he might accept would also be willing to accept him. QOTO is one of very few servers he stood any chance on and he kinda ruined that for himself.