Avoiding short stacks

[Brocken]

I've got to the point where I'm trying to avoid short stacks at all costs unless I've got a monster hand preflop. Say someone with 20bb raises it up to 4bb and it comes round to me in CO and I have AQo I'd most likely just fold it because I don't want to get involved in a hand were the most I can win is 20bb. I'd probably even fold AKo because whenever I 3bet a short stack they always end up all in with a high pocket pair.

Is this something I shouldn't be doing, or something I should be doing but maybe not so extremely?

Heh, as I'm typing this I 3bet someone with AKs who has 25bb and he actually calls instead of raising all-in and then, omg, actually folds during the hand with only about 10bb behind.