monopinionist 

Someone that thinks all people should have the same opinion, or view point, specifically, usually the opinion that they have themselves. They attempt to shutdown or shout over people with differing opinions to their own, often going to extreme measures to ensure people with different opinions cannot be heard. Tend to be politically left-wing and violent. They prefer to denigrate rather than discuss. Are anti free speech

Did you see Cooper on the news last night?, he's such a monopinionist, complaining about some guy giving a speech down at the university tonight, he obviously disagrees with, he was going on and on about it

monopinionist by a_guy_who_likes_chips August 18, 2018