Why is it that ARAM is the only gamemode where you can play without stressing?

I play ARAMs majority of the times when I'm not playing with friends, because I'm scared of getting flamed. When I'm with friends, it's alright because we don't flame each other. But right now too, I just queued up for a normal game, support/adc because that tends to give me support the most times, but I got filled adc, and my support kept flaming me, calling me a useless %%%%, shaming elo, even though I was trying, I'm just playing a role that I hardly ever play and I'm not good at. Why can't normal games be free of flame where you are allowed to try out new things without the need of stress? {{sticker:sg-soraka}}
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