A few of my pet peeves include slow sidewalk walkers, and just inconsiderate space-taker-upers in general. In a place like NYC you really do have to be considerate, since it's not a sidewalk as much as it is a highway. And you don't sit down to have a picnic on a highway.
Lately I've noticed a few older women who insist on wearing really high heels. They already can barely walk. This reduces their speed even more, and odds are, they will also have 2-4 shopping bags or giant tote bags hanging off their left arm, making them impossible to pass. Then, they also tend to weave from side-to-side. Please, if you walk very slow already, don't go with the 3-inch heels! Please. And that's really for all age groups. Slow traffic to the right...please!!
End vent.