Why do League players get triggered by constructive criticism?

I just told our mid lane Kayn that the champion thrives in the jungle and is highly situational matchup wise in the mid lane. And I must've set off an avalanche, because 2 other players went to defend him by 1. calling me an idiot, 2. pointing out that i'm an ex plat player, 3. he's still better than me. First of all, I didn't even mention his performance. He was struggling in mid lane and I stated that the champion was meant to be a jungler, not a mid laner, and they just instantly got triggered, saying I told him he was bad, which I didn't. xD I guess constructive criticism isn't recommended. :D
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