Maybe the best way to handle it is like when a little kid in a high chair throws his spoon on the floor for attention. Instead of picking it, just ignore it and he stops. Maybe just ignore the interlopers and they’ll leave. If their reason for being is as stirrer-uppers, it’ll be a failure.
There are several of these TROLL that even when they are ignore, keep posting. I just don’t understand them at all; they are ALL so unhappy ALL of the time.