Online, I cannot imagine folding pocket Qs pre-flop, especially in a freeroll. Maybe at the end of a tournament, in an expensive game, or with verifiably tight players. I might do it at a live table too, if I know the players. But online, the chances that someone actually has KK or AA vs. the odds that they are looser than loose and just going all-in out of boredom or impatience is just too high.
Of course, if you have QQ but you see a flop of AK5, you may as well fold to any sizeable bet because you're probably beat at a 10-person table.