This is such a braindead take. Humanity is networked. You can cut a link, but you can't disconnect someone from yourself unless you yeet them out of existence

Drive them into bigot echo chambers and someone has to deal with them thinking everyone is secretly as bigoted as them

Respond in kind - if they're rational, defeat them with reason. If they're a dumbfuck, quote then and mock how stupid their words are. If they're a troll, counter troll them

And when they feel bad for saying bad things, offer an olive branch. Highlight the path back to being a respectable person

You don't need to be equipped to do it all - I'm personally good at counter trolling and reaching out to those already verbally beaten down

We all have to live with these people - we all have a have a responsibility to do our part. Give them the social rejection they deserve when they say unacceptable things - people who don't learn from logic learn emotionally, so make them feel bad. It's ok to attack those attacking others unfairly - just always leave a path back to acceptance

Kill them or rehabilitate them - those are the only options that fix the problem