What? People are allowed to avoid people they have serious disagreements with? You have every right to have whatever unkind opinions you want to have, but that doesn’t mean anyone is required to listen to you or like you. You’re never going to be liked by everyone in the world, but if you can hardly find anyone willing to be around you, it’s probably time to do some self refelction
The problem would be payments though since you probably don’t want the instance admins handling your payment info. Maybe it could work more like craigslist though where payment is up to the buyer and seller to figure out, but that has its own problems. It does seem like it would be useful though if there was a way to make it fairly safe