When Can I Stop Listening to My Enemy's Points?

Never, because they won't shut up about them, because the goal is to exhaust everyone until they throw up their hands and just let them get their way. Stop fighting with words. Exclude them from every group, even if they're family. Don't hire them. Don't date them. Do every reasonable thing you can to prevent them from gaining control over anything or anyone. Do the same for anyone that even remotely defends their behavior. Find out they are the majority. Throw up your hands. Let them get their way. Await death.