So I think the user is mafp so no need to anonymize since you have the link to the question. Just come to the chat room or invite the user to a custom chat room if you are really curious about the issue and willing to attack the problem to its full extent... I had also similar problems with a user a year ago or so but everytime we made a chat session the issue was resolved (though his temper didn't go away, he was actually very aggressive and had issues on almost each question s/he asked.) Alternatively, ask another question and show that it's indeed not working then someone else can verify the solution.
If that's not a big deal for you;
In general, to avoid conflicts like this leave a comment and carry on. It's not an encyclopedia anyway. So wrong answers (not knowing if it's really wrong though because I have no idea about the issue) are not forbidden. Downvoting stuff is just not a good system instead one should simply forget it and leave it to the OP to decide.
But in my very very subjective opinion, taking it out to public like this won't solve any issues, instead would trigger the defense mechanism of everyone. Unless it's not really a big problem (insulting etc. involved) just nevermind.
EDIT (Just forgot): similarly others might have downvoted your answer too. So it's always good to ignore cross-downvoting possibility. Not only it's pointless, it's also noise. There is a famous joke about two bankers ..... :) I won't paste it here
DISCLAIMER : This doesn't mean that you are right and mafp is not or vice versa. I repeat I don't even understand the problem but the behavior pattern is very familiar.