This is your idea of verbal abuse? Obviously this is subjective, but I would laugh at you if you said this to me - like literally laugh in your face.
No, at some point you have to say the problem is being overly sensitive towards anyone complaining about your fuckup. The guy is right, and they fucked up - he shouldn't have to bend over backwards because they're fucking babies. Maybe they should try to have some accountability and integrity and try to fix the problem rather than get all pissy about someone who's being civil (the problem is nobody can agree on what's civil, and I understand this is not an easy problem). From my perspective, you are the problem here. And that's the thing, everybody sees it differently.