as one person mentioned, they are bannable offenses in that if you are harassing someone about their DPS, and they report you with screenshot evidence, then you could receive some disciplinary action.

I am on the fence about parsers. So many people run them and sometimes they're accurate, sometimes they're woefully inaccurate. I think they have gotten better and it is really the only way aside from DPS walls to know who out of the DPS isn't up to par. I really cringe when I hear that a PLD tank is outparsing a DPS as a tank with SO on.. that just shouldn't happen.