What kind of system or campaign setting that's less likely to attract freaks? I'd like to know what you meant by this lol
Older, obscure games without newer editions. These progs are posers and you won't get many updoots for playing Pandemonium, Recon or Boot Hill.
Older editions of popular games: more crunch, less "fun" modernity.
Cyberpunk if you really want to but with a twist: a nomad campaign set in the barren wastelands doesn't have the neon soaked megalopolis vibe and the glitzy tranny bars they loved in the video game.
Human centric TTRPGs: they weed out the furfags and the people yearning to play Black Elves with fros.
Pro-LEO games: I only know of Crime Fighter so here you go.
Cold War military or espionage TTRPGs: Commies BTFO.
Pulp TTRPGs: everything except the Indiana Jones RPG is probably too colonialist and White supremacist for them.
Wild/Weird West games: Dixieland or frontier only and pit them against Yankees, Mexicans or Indians. Or let them play Indians but describe the brutality of their raids in great detail.
TTRPGs set in Middle-Earth: they can't handle settings that are morally black and white, patriarhic and firmly rooted in European mythology and Christianity.
Any Star Wars if you run an Imperial campaign: rooting for the Empire was perfectly acceptable until the Disney takeover but the progs have been told that the Empire is literally the Third Reich. It's just the American Revolution in space (nobles, gentry, farmers and rum runners VS snobbish Brits) but don't tell them.
CoC: Lovecraft isn't enough to drive them away but they'll leave you alone if you choose the right setting. Arkham has been pozzed in 7th edition and Berlin is a freak's wet dream but if you run your campaign in a location like the Deep South or a colony they'll most likely avoid you. Always state that you'll run it as a horror game with a capital H instead of Tentacles & Tommy Guns.
Any Conan TTRPG: slavery is ubiquitous and they're drenched in toxic masculinity, racism and sexism.
Empire of the Petal Throne: the creator M. A. R. Barker was an honest to goodness Neo-Nazi.