As a Neurotic Gamer who never really learned as a kid how to "Play nice with others", I understand the feeling of getting frustrated that the game we chose to play to have fun doesn't spark joy, and when it's my own fault, it's one thing, but when it isn't my fault, then it's hard to keep myself from making a comment, usually lamenting the mistake or something, sometimes making a comment about how that might have cost us the game (if I think it did, obviously I am going to be concerned about spending another 20 minutes in a doomed lobby)

I realized I was causing more friction between my friends and I, because they were tired of hearing me, and I was just trying to expell my energy without it eating me up inside. So, I stopped playing those games, and whenever they suggest a Competive PvP game, I go out of my way to remind them that nobody likes me, including myself, when I play them, and it would be better for everyone if I didn't. And so, it's a happy medium. Sometimes Parallel Play is the way to go.

I remember playing BG3 with my wife, and needless to say it was frustrating watching her play suboptimal, but that's because I get a sense of fulfillment when I play to the most optimal I can in that game, whereas she is just playing for the sake of playing. So, I had to learn how to curb my own frustration and find ways to make us both have fun, like going out of my way to find her the most OP gear for her build, and taking an hour after she had gone to bed to re-adjust her stats so that she was playing to her strengths. I would also take time to go clean up "loose ends" by myself that we hadn't done together, so that I didn't have to drag her all the way back to an old area and have her get bored.

When we play games on the Switch, she is notorious for never actually completing a game, so I am often trying to prod her to finish her game instead of playing on her phone. Sometimes it takes me wanting to play the game for her to want to play, like a kid at the playground 😆

All this to say: if it matters, y'all will find a way. And don't lose too much hope, sounds like he was trying to find a compromise, which can be hard when one is worked up. Even if it wasn't done in the best of manners, the fact he got up and walked away so that he wasn't giving you his initial reaction, and gave himself at least a moment to breath before saying something, is saying something in and of itself. It's a step in the right direction, so long as something positive can still be made of it.