I was playing against a fed Graves

So as the title says I was playing against a fed Graves he was 13/2 yes thats fed a lot and he 1 shot me with an AA... 1 SHOT ME WITH AN AA... Thats ridiculous, no champ should be able to 1 shot with an AA even that fed, I mean a 26/4 Zed cant 1 shot you with an AA, 21/4 Zoe cant 1 shot u with an AA, nobody can except Graves and he didnt even have 20+ kills! If that doesnt need a nerf then nothing needs