I'm about as tall, large, blue-eyed, purebred WASP American as there is, living in the Tampa Bay area. I've traveled to the DR maybe 20 times in my life, and spent over 8 weeks there in 7 trips the last year alone.
My take is this: most non-NY white Americans like me don't even know where the Dominican Republic is, much less dislike Dominicans without reason. They only begin to scrunch up their noses when you tell them it's the place stuck to Haiti. The only Dominicans they are aware of are baseball players who come from "down there somewhere" (a benign indictment of the US public school system. Kids can put a condom on a banana in the dark, but couldn't tell you where Central America is).
Most non-NY/Miami Americans don't really judge Dominicans prior to actually dealing with them. A person stands on their own merits. Invaritably I'm asked, "Americano, si? Nueva York?". Based on how Dominicans treat me, NOT being from NYC is a positive thing. I am consistently treated by Dominicans with respect, a friendly demeanor, and a curiosity about non-NYC America.
I do understand how some Americans have ill-feelings toward Dominicans based solely on the Washington Heights sub-culture. I have never been there, and hear little of it in my isolated Tampa environs, so I have no opinion. But my NYC friends seem to have an altogether different attitude.
One thing for sure: even I have developed a certain disdain for the typical "Dominican Yorks" traveling in the DR with the Hip-Hop Bling thing going on. To me, they are the ones giving America a bad reputation, just as the druggies in Wash. Heights give the fine Dominicans a bad name.
http://i32.photobucket.com/albums/d29/cobra_boy_FL/domyorks.jpg