I have ended one friendship over this election so far. One of my oldest friends apparently considered Trump's success to be tacit permission to spew whatever hateful shit he could come up with. He started cheerleading Trump as soon as he began winning primaries, and everything he's posted on social media this year has either been pro-Trump, anti-muslim, racist, mysoginistic, some insane conspiracy theory, or a combination of those things. I've known this guy for years, even let him stay at my house for a while years back when he was down on his luck, and he was always a conspiracy theorist, but the rest seemed out of nowhere. I wound up blocking him just after the DNC and cutting off all contact. I think he was in the middle of having a meltdown on Facebook over Sarah Silverman "celebrating the murder of Christ" at the time.
Overall I try to avoid discussing politics with friends and family, unless it's someone I agree with, or someone I know I can have a civil discussion with, since a lot of people seem to want to take it as a personal attack when someone disagrees with them. It's been difficult this year, though. It's an embarrassment that Trump won a single primary, much less his party's nomination, and much less again that he has a legitimate shot at the Presidency. I've gotten into a couple arguments this month at work over the election, and even if Trump loses I'll probably have to skip Thanksgiving this year. If he wins, I'll probably have to skip it for the next decade.