[bbartlog]

This is only a fold if opponent hardly ever raises. If his raise means it's certain he has a Q in his hand (or 55) then sure, fold it. But I would expect many opponents to also make this move with the flush draw or a single 5 in hand, or a pair (and maybe even with nothing at all), especially if they think that your pfr means it's likely you have a low-type hand (A2xx) hand and that you might fold to pressure here.