Assume that it is folded to me in the small blind. If my cards have ANY redeeming feature, ANY! like they are the same suit, or can connect, or its Tuesday and I'm feeling good, I'm limping. Not every time. When I do it too often it becomes NOTEworthy. I'm sure others have it in their notes about me. But when I can get a cheap look at a flop, I'm gonna look! If BB raises then I may fold dependent on all those things such a situation is dependent on. IF BB is uppity, I may call with air or reraise. But usually I end up folding post flop. Every now and then I hit big, and its those times that make up for the losses in the sb.
But to just fold automatically in the sb with what someone considers an OK hand, is not so wise. OK is better than not OK most of the time, and BB is gonna have not OK most of the time. So there exists an opportunity, cheap, to improve on OK.