There are people on the far-left that say the same thing. Everyone with unhinged extremist views feels this way. That feeling by itself isn't data in support of the claim.
I am talking about any disagreement from the party line getting you banned, not "unhinged extremist views". The fact that you call it that highlights my initial point about political polarization very well. There are definitely subreddits on the other side of the political spectrum which also do the same thing. Point here is that the front page/default subreddits are curated with a clear politcal slant.
