Try this reddit site about Star Trek:
https://www.reddit.com/r/DaystromInstitute
You have to have a serious discussion of Star Trek or be blocked.
Serious about a nerdy tv show....
Read their rules on the right side.
Examples:
r/DaystromInstitute Rules
1.
Explain your reasoning
2.
No whinging, jokes, memes, and other shallow content
They might as well just say “Don’t post any politics to the right of Bernie Sanders” but that would give away the game. Consistent and clear rules would get in the way of their selective enforcement and modding.