/r/conservative doesn't even allow comments of users without a user flair.

They state: "This is designed so that a couple posts per day are almost guaranteed to have conversation which is not hijacked by leftists and other non-conservatives.Who Gets Flair?

Only mods can assign User Flair, and User Flair is only for conservatives. Once you have a solid history of comments in /r/Conservative, and have been commenting in the subreddit for at least two weeks,[..]

Please understand that this is for conservatives. We do our best to vet you based on your post history on reddit. You will need some post history to qualify - ideally within the subreddit itself. If you do not have a conservative leaning post history you will likely be asked to re-apply when you do."

"Strangely" there isn't a single post on their frontpage at the moment, which doesn't require a flair to comment.