I have to agree with Meself - I'm not aware of any particular US anti-Gypsy/Roma stereotyping, but it is commonplace here in the UK, where it is a gross insult to call someone a 'Gypo', the inference being that that person is dirty, or a thief, or both.

My contacts in the Gypsy-jazz world still refer to it by that name, or 'Manouche'. I've never heard anyone refer to it as 'Roma-jazz', in fact to my ears it sounds...errrmm...ridiculous. Anyone involved in Gypsy-jazz knows precisely what the team means and it is not intended as any kind of insult - rather the opposite in fact, players of Gypsy-jazz have a tendency to be very good indeed.