Poor fold on my part?

[tigerite]

Sorry to be a dick but the only answer I can give is: It depends. On your opponents, on your stack size, on their stack size, on blinds, on the short stack and his relative position (if any), on your image..

For instance here with K9o I am pretty sure there's almost no range they can have anyway whereby calling will cost you $EV. Plus the fact that if you push, the BB should fold a hell of a lot because of the short stack. If the short stack calls, he should get out of the way as well anyway, unless he has an even better hand than if the short stack had folded. Stuff like that should always be in the forefront of your thoughts.