Hi Jet,
I don't work in Dubai, I work in a nearby approach unit that also begins with a 'D' but unlike Dubai and Baghdad everything here is wonderful and I couldn't possibly start to think of how we could improve conditions here.
Nevertheless, despite our near perfect situation, we too have to repeat ourselves an abnormal amount of times and correct read backs on a regular basis and this tends to upset some controllers more than others.
I would guess you have encountered the few edgy ones that would tend to stand out and who would be edgy anywhere they worked. Possibly they've been hired over the last few years (turn around is quick out here) and that would make it appear as a trend.
As Guy says there's no excuse for it but I wouldn't label it as a 'Dubai' experience, more of an unfortunate individual encounter.
Always keep the big picture in mind: Sunshine and Dirhams!