A little backstory first, as always.

I joined a group of friends playing D&D a little over a year ago. A little thing about the DM is that he is terrible at balancing the magic items we get. Some characters are significantly better at combat than others. This wouldn't be an issue usually because I play a Bard (Musical Guy) and my specialty is not combat, but our usual sessions consist of fighting and fighting. When we are not fighting, we are talking with people with ungodly charisma stat that are impossible to persuade.

Recently, we had an offshoot of that campaign in a battle royale style. This is already terrible for my character, but this combined together with some unreasonable calls on plays people wished to do and a specific argument about hitting people with a fireball made me kind of pissed. I also made some vocal complaints about how one character gets a 10000000 to hit on their bows and I can't even heal more than 10 health to my allies.

Then, I just left. I said goodbye like it was just me needing to go somewhere and I packed up my things and left.

I don't feel great about leaving, but I wasn't having fun there and felt like I would have escalated the situation beyond what it was already at and create a larger issue than the game.

TL;DR: I left a D&D session because game balance seems to suck to me, I wasn't having fun and disagreeing many times with players and DM.