First off, anecdote != data.

But I'll bite.

> The newcomers with dogs would chuck their dog's droppings over the fence and onto the ballpark.

This seems more like douchebaggery than entitlement. If I had to hazard a guess, douchebaggery isn't limited to gentrifiers.

> Seems like the newcomers didn't like the bodega feel when they were out walking their dogs.

Seems like a function of (middle-to-upper-class) western life and its disappearing third places. But perhaps playing dominoes in the park is illegal?