Such a sick sick spot 5/10 hand

[mindless]

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grooooooss preflop 3-bet.

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yeah i know. I was in preflop aggro mode but soon as I repopped I knew it was bad hand to do it with vs an UTG+ opener.

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Is that because we're in deep trouble if we're called? I feel like in a 6max game I'm 3betting KQs against a 27/21 a lot since I think it's ahead of his range and he'll call me pre a bit light, but am I just setting myself up for a reverse implied odds situation? When HEK and MDMA strongly disagree with something I do frequently, I know that's a bad sign for me, but I want to understand the reasoning. Better to do it with 87s or 66 or QQ, but not middling strength hands?