Doesn't really bother me, unless it is used in the wrong context. DPS or DD (never used DD before), I don't care, if that's the standard here, then I can adjust to it. I won't enforce what I'm use to others.

On a not so important note, DPS actually means Damage Per Second, and is actually a statistic information, rather than a description of player roles. Compared to DD (which I assume means Damage Dealer), which is actually more accurate and appropriate in cases like "I'll be DD", rather than "I'll be DPS". But really, I don't care, I understand what the person is trying to say.