He's essentially saying that debating people you disagree with about sensitive topics that have real world consequences is not worth the time because those peop

He's essentially saying that debating people you disagree with about sensitive topics that have real world consequences is not worth the time because those people are wrong and they aren't going to be affected by the outcome one way or the other. So because he thinks the other side is wrong from the outset, and is quite certain they have no skin in the game, they aren't to be listened to. This is why people are leaving the left in droves.