I am the worst with video games (well, and plumbing, but that's not really a game). When my brother hosted LAN parties, I noticed that people liked being on the opposite team that I was on, not because I was a bad player (although that might have been a part of it), but because they thought that my cursing fits when taken out where hilarious. In fact, I heard that one of the key indicators that they were in trouble is if I suddenly got quiet, as it meant that I was doing really well.
I don't like this side of me, especially when I turn my bile on people (usually my wife) who try to calm me down or hush me. A few minutes out of the testosterone rage and I feel a deep shame and terrible self-loathing. Sometimes the shame is in the background even when the rage is still being expressed. Those are particularly awkward moments when I am mad at myself and yet redirecting it to those around me.
Thankfully, age and experience has reduced a lot of this. I have become more accepting of the idea that winning is not everything or the only thing, and that fun can still be had in a game that ends in a loss. Still, I have a ways to go.
... Especially when I lose to a player who cannon rushed on StarCraft ...