I love my sister.
Despite her agreeing to my boundaries* she strays into spewing divisiveness, anger and hatred in her speech when she talks at me on the phone. Because I love my sister, I listen without saying much. If her venting goes on for more than ten minutes or so, I conclude the phone call. While she vents I include her in a greater love. This has helped with pleasant conversations about our mutual past most of subsequent talks/ actual conversations.
*boundaries - no talk about politics.
I have a few friends who insist on going negative. I don't avoid them altogether. I use divine love to include them with me without expecting results of any kind. This has yielded some amazing results from time to time.