You're right, it is an ordinary occurrence. That's why those who weren't born that way hide and masquerade as others. [But he had received those threats even when he was still Human, so it didn't make a difference to him who received them or not if there was no reason for it.]

Care to inform me how I've annoyed you? All I've done is walk by, inform me so that I may not offend you again, sir. [In case his wording didn't do much to carry it across, his tone definitely held hints of sarcasm.]