Dialogue is a big part. I think the thing I have noticed in the internet is the reduction of red vs blue. Old vrs young. Left vs Right..etc etc
This seems to encourage a right vrs wrong arguments or a virtuous points scoring system. Deploying a dog whistle slogans is a tactic of either side of this
I view it as an effort to shut down the other side rather than hold dialogue and debate.

I fancied cola