This feels like a uniquely American advice. I have had pretty heated, but not damaging, discussions with people on the completely different side of the political spectrum here in Norway. I can't remember a single time I have cut someone out for having a different political opinion.
Maybe the loneliness problem is partly connected to the American political system at this point in time?
Half this country voted for and supports a vile lunatic president hell bent on destroying the U.S. to enrich his personal wealth and power. It's not surprising that over here we Democrats view Republicans as a cancer we want nothing to do with.
It wasn't always this way. In the past Republicans actually had some decency. That went out the window after they elected Trump twice.
Maybe the loneliness problem is partly connected to the American political system at this point in time?