I can see the concerns of those who believe that some “liturgy shamers” are out to simply get one up on those who would use this tactic as a method to sow division in the Church, but at the same time, the priests who perpetuate these abuses bring this kind of attack and ridicule upon themselves, and have only themselves to blame in the end. If you don’t want to be “shamed” on the Internet for making a mockery of the mass, then don’t…make a mockery of the mass. Priests should supposedly know better than to ride a scooter down the aisle, have interpretive dancing during the consecration, or decorate the sanctuary with memorabilia from their local sports team, but then and again some clergy need to be reminded by more orthodox clergy and often even more orthodox laypersons that this is not in keeping with the solemn character of the mass.
I agree that the bishop/diocese should be the first to be notified, but often the parishes perpetuating these abuses advertise them more blatantly than those doing the “liturgy shaming”, so usually someone posting these pictures is just taking them from a parish’s Facebook page or website and pointing out the obvious problems. And maybe a little public shaming is exactly what some priests and/or parishes need in order to be woken up to the reality that what they are doing is wrong, and may even sometimes be the catalyst that forces a bishop to take action. As children are taught when they are young, sometimes bad actions and decisions have consequences that we don’t like.