From what I remember from my childhood, I do believe I was a sore loser too (although not to the point I would make drama out of it or just quit mid-game, I would just get really grumpy).
Although, looking at what your son likes, and doesn’t like, it sounds to me he likes being alone? Which isn’t a bad thing, I had a lot of fantasy when I was young and loved playing on my gameboy/GBA and really loved Lego (my parents had an indoor ping pong table that was converted to a regular table so I could put my train set and town I made).
So perhaps, instead of enforcing him to play board games, perhaps encourage his ‘creative’ side (since he likes Minecraft, I think he likes building stuff).
That competitive nature might not change easily right now, but as he grows older he will naturally learn to tolerate ‘losing’ more and more. He will meet friends who play games, want to play with them and come to understand that he will need to accept the losses, get better and learn the true value of victory.
Nah, my father did that too and look how I turned out…ok wrong example.
I wouldn’t really say that as the ‘cause’ (such an ugly way of putting it).
He might also be used to it that your son always gets what he wants. Whether it might not be from you, he would get it from his father (and vice versa). I mean, it’s important (I believe) that as parents, you stand a unified front as to what is, and is not, allowed. Blaming each other for how things are, doesn’t really help changing the situation.