All messageboards have moderation.
Some boards work fine with informal moderation- posters just point out something is wrong, bad, or not allowed, and the posters have the self-discipline to control themselves afterwards.
Most boards require at least some moderation, because boards with zero moderation descended into incoherent noise as trolls overran the boards. (We're talking the 1990s, generally.) Since then, there's always someone in charge of making sure things don't devolve so badly that normal posters can't get in a word between 20 pages of trolls flooding the board.
If you don't like the way a board is run, make up your own board, and invite who you want. Then you can feel free to snub me or anyone else you don't like because we're not allowed there.
You can also just find a different board you like. There's no constitutional right to the GSC. There's also a lot of disagreement on the GSC because there's room for a lot of disagreement on the GSC. If you're getting static from several members, you've actually found something that disparate members can agree upon- even if that something is "you're posting like a jerk." With all the room for disparate opinions here, I think that may be one of very few things where a consensus can be found on the GSC.