I (Ranger) had another player (Rogue) yell at me and steal from me because I apparently endangered the party, or didn't listen to her, or something. I still don't know what I did to warrant getting yelled at. For context, we had just gone up against a pretty tough dungeon boss.
We were caught off guard and I thought the boss was going to kill us so I told everyone to retreat. Everyone did, except one person (Cleric) who stood like a dumbass and tried to fight 1v1 against it. Naturally when I realized that he didn't retreat with us, I went back and said that we have to save him. By some miracle the Cleric was not immediately killed, but he eventually did get KO'd when the boss was nearing death. The boss tried to make a deal with the rest of the party to allow Cleric to live if we left, which everyone else caved and agreed to, but I did not as Ranger had a personal stake in killing this boss. I put up a protective barrier around Cleric and continued to fight. One turn later and the boss was killed.
Immediately, Rogue gets mad at me for not taking the deal. I explained that I knew I could protect Cleric and still fight, which she then yelled at me for not telling her my plan. We were in the middle of combat and if I said what I was going to do to everyone else, it would have to be in character. I explained that I couldn't just tell everyone my plan right in front of the boss otherwise he surely would've killed Cleric, basically telling her that she was asking me to metagame and I wasn't going to do that. She then brought up that I didn't do what I told everyone else to do when I called for a retreat. I don't know why she thought I was responsible for that when Cleric was the one who didn't follow directions and endangered the party, and I said as much to her. It was at this point that she found an heirloom of Ranger's and pocketed it right in front of him.
If I weren't good friends with the player or was 100% sure that this was all in character and not some kind of attack on me, I would have pvp'd her on the spot because it's unironically what my character would've done in that moment. But I couldn't shake the feeling that this was directed at me and not Ranger so I didn't go for it. I was not about to ruin the campaign with pvp over something this petty, especially if the characters' actions are not separated from the players'. But in the sessions following, Rogue constantly made remarks about how she has this heirloom and held it over my head, and it wasn't done in a way where I could respond in character so I was forced to ignore it each time. It got to the point where I nearly left the party because of the constant antagonizing.
Thankfully it didn't come to me leaving, but it's mostly on the fact that we skipped about a month and a half of sessions and nobody remembered what was going on by the time we played again, so the plotline has been dropped. In game though, it hasn't even been a full week since this incident and Ranger no longer trusts Rogue over this, as well as some other things that have happened before and after the incident. He isn't going to tolerate her in the party much longer if she doesn't start making amends and return the heirloom. So I'm trying to figure out the best way to resolve this without going through another awkward, half out of game argument.