Depends. If they're apologizing cause someone forced them to then you can at least have the piece of mind the one who made them do it is gonna give em hell for the half assed apology. On the other hand, if they're apologizing cause they feel you overacted when you didn't and they were just being a jerk and apologized to try to get you do be less annoyed but didn't actually mean it, that's annoying but at least they cared enough to say sorry even if they didn't mean it. If hey're saying an apology just to mock mock someone and don't mean it at all, i think it'd have been better if they just stay quiet. As for not apologizing, also depends on the circumstances.