Gab isn't some stealthy hidden dark-web thing that you can only access from behind seven proxies after a thirty-step initiation process. Same with Alex Jones. Nobody's breaking into their homes and secretly recording statements they'd never ever make in public; these folks are getting up on soapboxes and gleefully shouting at the top of their lungs in the explicit hope that as many people as possible will hear and know about them.
So, yeah, it's 100% fair for people to point to the person standing on a soapbox in the public square who's screaming at the top of his lungs, and say "I don't want to be associated with him, or with anyone who supports him". That's freedom, and the guy doing the screaming has no grounds to try to forbid that; that would be censorship of others' opinions.
It’s a very different scenario.
It’s more like people are hiring private investigators to follow gay people around and get a list of businesses they frequent and then organising harassment of those businesses until they refuse to do business with the homosexuals.
It’s orders of magnitude more creepy.