IMHO that's not a solution at all. It merely creates information bubbles. I don't want diverging opinions to go into a killfile, I want mechanisms that force all users to deal with each other in civil and minimally polite ways, just like the vast majority of them already they do under normal circumstances in face to face communication.
I think your glasses are a little rose colored for in-person communication. The rule older than my grandparents is just don’t talk about anything controversial, and only see “those” family members once a year at Thanksgiving.
