If you are having trouble with people ragging on you with parser numbers in PUGs there are really only 3 scenarios.

1. They are a dps diva. They are either overgeared and wrecking you, or barely beating you by 2 dps and want to rub it in your face. Ignore them, much like you would ignore a gil seller. Really you can't stand this? How did you survive any pugging?

2. You are really sucking bad. This is your fault. Being ignorant of your dps doesn't make your dps any better. Perhaps this will motivate some to improve. Perhaps it will motivate some to quit. Either way, the quality of duty finder is improved. Not everyone is going to dps shame you either. Perhaps they have legitimately helpful tips.

3. Somewhere in between. This depends largely on how sensitive you are.