Why people think META is god?

Seriously, why people think META is everything? I mean i know you can't go AD Ahri unless you want to troll, but other things like Zac Support or Thresh AD work, but why people think it is bad because it isn't meta? And before you say *derp voice* ''but you have so many loses with AD Thresh'' think about who I was top with, lose with Thresh AD, enemy top Kled (I fcking hate him), lose with Thresh AD, enemy top Jarvan (he's not OP but I was dumb enough to not play safe), lose with Thresh AD, enemy top fcking Teemo (RITO, why?). Ok now returning to the main point why people hate off-meta picks that can work?
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