A lot of the time i find that I'm in the BB with a craptacular hand (K3, J5, 38 etc) and the SB will try to steal with a minimum raise. I rarely like to put in a bad chip into the pot (unless im the agressor) so I constantly fold, and will re-raise if i pick up a decent hand, and call his raise if i pick up a hand that has potential. Is this what I should be doing?

What about heads up? Today I had to use the strategy above because he had a 3:1 chip advantage. I finallly picked up 99 and re-raised and he pushed me all in. I called and he flipped over AA. Probably just a cooler, but at least did i play the hand correctly?