Forgive my ignorance, but why not just make a dedicated forum that outright bans LGBTBBQ+- discussions? Why even bother going on reddit when you know the outcome.
We've tried that. They show up and spam child porn until the payment processors and web hosts shut the site down.
They've done this repeatedly and it's part of what they did to horusgalaxy.
The only forum I've ever known to survive this attack was Kotaku In Action on Reddit and that's partially because it's a very useful containment sub, their mods are autistically slavish to keeping the sub safe and communicate with the admins all the time, and it allows for the very much against the rules mod-bots to ban anyone who posts in it, so it functions as a self-reporting anti-Chud filter for the rest of the site.
And even then the only thing that saved them was Breitbart pointing out the tranny moderator that was going after KiA with the "I'm deleting your mods now because I don't like them ok now I'm deleting your sub because it's not moderated [smugglypuff AGP smirk]" scam was an open and proud pedophile who moderated 500+ children's subreddits.
In response KiA outright banned all mention of the faggots and troons, both good and bad, with automoderating for anyone who mentions any of the forbidden words. That is, suffice it to say,
not what the troons wanted, but it's technically not against the rules and the Admins refuse to make it such, so they can just sneed right now.