Well, as far as maintaining the social graces goes (especially at work) I can see it's utility as a response, I agree with you there. But I'm the kind to treat such things with not much more than stunning silence and maybe some pointed looks, unless the person responsible for that is ballsy enough to call me on my non-reaction (few are since they seem to figure out, without without me saying too much, what the problem is, more or less). If they do ask me what's wrong, and if I choose to tell them, I don't mince words. But that's just me.