Just found out that an old mentor of mine, who has taken a hard swerve to the Alt-Right, has blocked me on Facebook. I thought they had left FB, but a mutual friend said they are still on FB posting Alt-Right memes daily. It saddens me that political propaganda can make us so brittle, and our relationships so fragile, that we retreat into our safe spaces of only people who hold to the same dogmas we hold.
Now I have blocked people on FB too, but I think I have only blocked people who (a) were super-argumentative but not my friend in real life, and/or (b) were verbally abusive to me personally, and/or (c) advocated violence against persons they despise or disagree with. But as long as someone doesn't cross these boundaries, I stay in the conversation, even if I find most of their posts to be complete bovine excrement.
So, it saddens me when someone exiles themselves from relationships so their ideology will remain unchallenged. It can even mean a loss of memories and experiences that were only shared with that person. So, as I have said many times: Stay in the conversation, and learn how to debate using evidence and reason, instead of memes and insults.