People are always going to find way to try and kick or complain about people, it just happens. From the Blackmage who is just learning or only uses Ice to the Healer who just heals instead of DPSing. A parser will help those who really wish to try (and if its a self parser then no worry), we have many people who are already using parsers and silently judging you every run, they just don't say it. Will people get more vocal or try to be rude? Only the ones who would find reasons to complain or kick you to begin with but if people see you trying I would hope common sense will tell them to shut up rather than get snarky and say "Why arn't you hitting more!?! I can do __ dps".

Granted I know I would get the eye twitch going if I could see DPS of everyone and saw the healer constantly at 0.