Why are gamers so immature or childish?

Like I play games for fun, i play games to let off steam but I like being with people as mature as me so I don’t like immature kids or adults that act like immature kids but i see so many Gamers who act like complete Kids and so immature… Like why, do video games shrink the brain? It’s even worse on Online games like Fps and MOBA games. etc so i don’t get it…
Why are gamers so immature or childish?
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