Competitive games in general lead to that unsavory mindset. It's hard for people to separate the idea of testing their skill against another person with that of comparing their worth to another person. They're entirely different things, but it's sometimes hard to remember that. Thus you get people linking their self esteem to their ability to push buttons in the right order in a game. Of course, it's silly, but most everyone does it. Probably some deep psychological reason for it that hearkens back to hunter-gatherer times.
Also, radishes.
Yes, but there are competitive games, and then there are MOBAs.
MOBAs are different than most other competitive games for 2 reasons:
1. You can always see what your teammate is doing. This feature of non-MOBA games has a very ignorance-is-bliss aspect attached to it. If you can't see exactly what your allies are doing (say like in an FPS), you can't get extremely angry at them for making foolish blunders "that only a retard could make". I suppose in RTS games you have the ability to see what your teammates are doing, but often in those games you are too busy to pay attention, are playing solo (something not available in MOBAs), or playing with a friend, who you respect too much to insult.
2. You can't just leave the game. Most people take for granted the ability to just leave games in an FPS or RPG environment (in RTS it usually isn't necessary, for the reasons above) and be replaced with another player almost instantly. It prevents a lot of conflict and derision because if you find yourself getting frustrated and/or angry, you can just leave and take a break or join another server. In MOBAs, sometimes you are stuck with the same 10 people for 60 minutes or more. For leaving the game you are severely punished, and so the escape mechanism which most other games can afford is taken from you. This leads to unbelievable amounts of rage when combined with point 1.
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On the topic of getting angry or frustrated with yourself over bad performance, this is something I caught myself doing for a
LONG time. I honestly don't think the reason has to do with the hunter-gatherer times, I simply think that many gamers are very insecure about themselves, and so they try to find self-validation through their video games (everybody wants to be good at
something right?)
When they start doing badly even at that, they often have to ask themselves what they
are good at, which can lead to a lot of frustration and disappointment. At least that was the case with me.