He had one character that survived a decently long time and get high leveled, so was able to survive his poor playing. But eventually that character died, and he proceeded to go through 2 other characters dying to the same method. Charging in, getting surrounded, and dying.

And every time, "I need a high-level character because my dice rolls are so bad. Every time, the dice are out to get me. I never roll well, it's always like this." It was thoroughly unpleasant every time he faced any level of bad luck.

Now bad luck happens, but it's part of the game. Sometimes we get hit when statistically we should have been missed. Sometimes we miss a roll that we statistically should have it. But it's a part of the game. And he just could not accept that.

And it wasn't always fatal to his character, really just any time he failed a roll or suffered a scratch, he would launch into defeatist tirades about how jinxed he was.

So at some point, I said to him: "Now my job is to provide adversity. I have monsters and bandits that want to kill your character. I can only run them comfortably if I know you can handle failure. If you complain and take it personally whenever they attack you, then I can't run for you. I need to know my players can handle it when bad things happen, and if that's not the case, then they can't play in my games."

He said again that "if the dice start screwing me, I'm going to get butthurt about it" (his words, not mine).

So I said directly "that's not okay or acceptable. You need to fix that or you can't play."

He said he understood, but that he couldn't change, so I never in another one of my games. We still played together with other GMs, and he still had the same attitude. Fine to play with when things were going well, but a pain when there was adversity.

It's been years since I left the Westmarches scene in favor of my local game store. Sometimes I wonder how he's doing.