Using a minority cause to bully around others. Such people might look like nice, helping people fighting for a just cause but their true intentions become annoyingly clear when they get a little power. In their view they can now tell everybody what to say, feel and think because initially there was a good reason.
Rando: Hey let's go to this club and have some fun!
Social Hitler: You are so egoistic and only concerned about your fun! Do you even respect women at all?
Please pick up that trash on the ground here and buy me drink to calm down over this insult to someone else i pretend to care about!