OP, are you trolling? Just kidding! Please, please don't make a post about my douchebaggery!

But seriously, given:
1) We have no screenshot with what was actually said,
2) We have a biased version of only one side of what happened,
I don't see any thing wrong with what he did. If your damage was so bad on Moogle fight that someone felt the need to question your intentions, I would probably do the same. I may or may not run a parser, but when I can know for a fact that my straight VIT build WAR is outputting 25%+ more damage than an equally gear Zenith dps, I often have the same thoughts that healer did. It really sounds like the healer was taking the fight seriously for himself or someone he was helping, and thought you might be trying to ruin it for the others.