To be blunt, you can’t.
If you stay calm and corner them with facts, they’ll shriek, scream, get vile, and ban you.
If you try to match their virtiol, they’ll shriek, scream, get vile, and ban you.
In fact, if you don’t agree with them 100%, they’ll shriek, scream, get vile, and ban you.
It’s like trying to teach a pig to sing: Can’t be done, and it annoys the pig.
PS Sometimes annoying the pig is fun, but don’t expect any other result.
I like the way you said it better than how I did.