This one may not seem as bad as other stories that get posted on here, but this one was a nightmare for me and it caused me to make the rule of no talking about politics during my sessions. This was a little longer than a year ago. I had mainly DMd for friends, but I've run a few short adventures for random people for a few years and never ran into any problems. I post on a discord channel about me running a homebrew campaign and in about a few hours I have four people and myself.

I do a session 0 and everyone makes their character. We had a monk, rogue, druid, cleric, and either a wizard or sorcerer. During this session 0 I found out I actually played in a Fallout homebrew a year prior, so I was very excited to run this campaign. To be honest, everything was going well until about session 4. The party was investigating a cave when they were ambushed by a large snake and they could hear more down the cave. The cleric was a nature cleric and cast animal friendship to diffuse the situation. Everything seemed good until the monk decided it was a good idea to still attack the snake, which angered it and its friends. Tbf, his flaw was that he was deathly afraid of snakes, but I had assumed he was just going to run away, not run 20 feet towards it to attack it. After combat, the cleric was rather not happy and there was an OOC argument between the Cleric and Monk. The cleric felt it was unfair and dumb that he used a class feature to roleplay and it was wasted by a "that's what my character would do" moment. I was using FGC at the time and my wifi had gone out so I thought we'd take a small break until I could figure this out, and that's when the politics happened.

It has been a year or so, so my memory of it isn't perfect on this part. While I was looking up the answer to all my FGC problems, one of the party members began talking about republicans and how democrats are snowflakes, affirmative action is bad, trump is good, etc etc. The rogue and monk when on about this while the cleric was uncomfortable by this and was trying to understand their thought process. The wizard was just kind of there, and the argument began to get more heated. I will take part blame for not mediating the argument or trying to stop it as soon as it came up, but tbh I was more focused on trying to get DnD working and half-listening. after about 30 minutes I couldn't find the answer and I decided to just call it for the day. Unfortunately, the cleric was having no more and said that he won't be coming to any more sessions as he doesn't want to be around that kind of mindset, he said bye to me and then DCd. I sent them a message apologizing. He was nice about it and I understood why, so I sent him a message saying hopefully he and I could play together again in the future, but all he sent was "Heated gamer moment." which to this day I still don't understand or what he meant.

The campaign only lasted a few more sessions and I eventually disbanded it. Now if anyone brings up any kind of politics that isn't part of the campaign we are currently in a shut it down immediately and make sure to let everyone know that it'll be a big no-no at my table.

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TLDR; ran a campaign for random people, monk did a that's what my character would do thing, caused party conflict, my internet broke, while fixing it party got into argument about democrats and republicans, a player left and campaign crashed and burned a few sessions later.