The tone, the mean-spiritness, discussing posters instead of issues. Even if you don't start that way, you become what you try to resist as a matter of survival. But some are quite mean.
However, some people just cannot deal with politics due to disagreement and probably avoid it for that reason.
"One White House official with knowledge of the conversations told me that the Russian ambassador raised the sanctions to Flynn and that Flynn responded that the Trump team would be taking office in a few weeks and would review Russia policy and sanctions. Thatís neither illegal nor improper." ~ Bloomberg
When do we get to see the transcript? Flynn, being in espionage, had to know his call was being recorded too.