QQ is the theoretical 6th nuts against UTG range. It is a perfect hand to call, realise your equity and maybe fold on A/K turns but sometimes I'd still call. He can overplay AJ, for example, but it is small portion of his gii range

First of all: 3 bet pre flop always with premium hands QQ+
Specially on the early levels.

Flop was normal action, Im going all in too

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Without any history or reads it looks like villain has AA or KK. Folding isnt impossible considering you did not raise pre. I agree with raising preflop, it puts you in less awkward positions postflop. I think a flat call can be good as long as you know you can take advantage of a certain player postflop.