Why is the weekend so toxic and cancerous?

So far during weekdays I haven't met a single toxic person and had good vibes with my teammates but when the weekend starts I always get toxic players that just outright ban your pick, troll in game, blame you, go afk and report you. This happens to me every second game I play on weekends, where someone says 'oops' after banning my pick and later blames me for him losing his lane.
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