The same way you prevent them from becoming progressice/racist trash bin worse than reddit.
You let them speak and prove them idiots. It's really not hard. Unless you're constantly on the side that's losing, then it's pretty miserable.
But know that even though you're losing now you can reformulated your arguments and try again because no ones going to censor you. You have all the same rights because you, like they, are people deserving respect, no matter how much you look down on them or hate them. And that's what I tell them about you.
You let them speak and prove them idiots. It's really not hard. Unless you're constantly on the side that's losing, then it's pretty miserable.
But know that even though you're losing now you can reformulated your arguments and try again because no ones going to censor you. You have all the same rights because you, like they, are people deserving respect, no matter how much you look down on them or hate them. And that's what I tell them about you.
Less hate more love.