Why are people so against building tank in urf?

Like I was playing olaf and no %%%%ing way you're gonna get close to people building full damage. So I went bork into tank and could even beat a late game yi. And that yi is now flaming me for building tank. Saying I'm playing a fun gamemode and tank is not fun. So why is Tanking damage and winning not fun but Yi using Q every 0.9 seconds is? People suck.
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