This 
If you can’t or choose to not understand then you are part of the problem… obviously.
Creating a toxic selfish environment in an MMO is unhealthy. It didn’t exist back when an MMO was social and it started surging with a change in the playerbase mindset towards a selfish and egotistical one.
„If you don’t like then don’t join“ is a very lazy excuse and doesn’t stop the phenomenon from killing the social core aspect of the game.
I am a tank, I have a chat filter and ignore list, I’d never join such groups - yet I very much see the disgusting environment they are creating