Well so you are saying that a player won't agree and is being disruptive but won't leave? I find that a bit hard to believe. In high school we'd have gang tackled him and beat him and then forcibly thrown him out. Nowadays, I call the police? I just can't imagine a player defiantly refusing to leave.
Oh, there are all
sorts of things adults can do to pull this off that younger people wouldn't be able to. Calling in favors from friends. Exploiting social group dynamics. Whispering the right lies in the right ears.
As soon as we start assuming actual malice from the player, almost anything is possible and quite a few really horrible things are very much on the table. Many of those things can string out a problem like this for weeks to years, and can destroy friendships.
Of course if it is that players house, the group just gets up and leaves.
Do you truly think it's that simple? Because I promise you, the social cost of doing this is something a LOT of people aren't willing to pay.
"...accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed." (Declaration of Independence)
And despite how strongly I'd not want you in my campaign, I do find it incredible that you would have any trouble finding a game that suits your tastes. There are a lot of diverse views within the hobby on all of this stuff.
I spent over a year looking. At first just for 4e, then for 4e-alikes (e.g. 13th Age), then for anything-that-wasn't-5e (e.g. PF1e), then finally 5e because SOME eh-I-don't-prefer-it gaming is better than absolutely no gaming at all. I failed.
The only reason I'm in any games right now at all is because Hussar very kindly offered me a game. I was also in a short-run 4e game run by another user on this forum, but that's long done now.
So...yeah. I tried. I tried quite hard. I scoured forums (including this one). I scoured Roll20. I put up ads. I checked discord servers. Multiple days a week, even. My schedule is very open (other than my weekly DW game), so schedule wasn't an issue. I even went for PbP games, all of which folded within weeks of starting. A year's labor left me with no prospect of an ongoing game, so I gave up.