I can't speak for the rest of the US, but in a lot of places here in the southeast, you start talking about Roma as an ethnic group, and you get blank stares. Then you resort to "gypsy" and it's all "Oh, like in that Disney/Stephen King/whatever movie!" or "Oh, like that creepy old lady at the fair!" There's a good portion of people here who apparently didn't know they even existed outside of fiction.
Apparently, the stigma still exists in enough of the big city areas, though, that when they wanted to return Magneto back to old-school villainy for awhile, they tried retconning his background to Roma. That didn't work out so well.