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I can be harsh too, but one way or another this is not a reason to get personal, even if the user does not enjoy public trust. I think no one will deny that the Internet is a merciless place, but still you need to be a little more courteous with others because in the end you may be in his place (considering that earlier everything was in order with him and his judgments). 
Yes, you are right. Better not to get personal, what happens is that this comes from some time ago, him insisting that I have an alt, naim027, based on his lucubrations, not in proofs, obviously, because we are different people. I have put him on ignore to prevent problems.