Can if they make it a believable apology instead of trying to make it seem like it isn't their fault they upset someone genuinely. Water under the bridge as I say, but then again everyone doesn't have to like everybody else do they? Sometimes people clash for no reason, and one side always trumps the other in opinions. Better to not talk it out then to have to deal with others justifying their actions. A simple sorry would suffice instead of a rant.