Check the heavy handed moderation on subreddits like the /r/conservative and /r/the_donald.

The former has many threads that are marked "conservatives only" which auto delete any comments from anyone not tagged as conservative by mods. t_d will just delete your comments and ban you if you dare to speak out against Trump.

And all this is not even counting the downvotes you get for speaking your mind in rightwing or alt right places.