Well, yes and no. Pick pockets, drug dealers and so on basically it's a problem related to having very poor people who get excluded from society specially when it's not only them but the whole environment/community where they live. Let's say an isolated ghetto, specially if it's from a foreigner culture because they get excluded from the rest to they get isolated with the people they know. And if there is poorness, pickpockets, drugs and so on they very likely end doing that. And this happens here with Spanish, foreigners, white, black, gipsies, arabs... whatever. It isn't their ethnicity, origin country, skin color, whatever. It comes from being excluded from society because of being poor.
I live in the city next to Barcelona (El Prat de Llobregat, where the Barcelona airport is located). Back in the '80s we had there a poor district where there was a ton of drugs, poorness, violence, grand theft auto, gang wars, kidnapping and so on, all the horror stories you can imagine. Mostly Spanish whites and gipsies, but specially gipsies got stereotyped here. We're talking a place where they made a giant raid with over 600 policemen including helicopters and so on, and they only found 2KG of drugs. Some areas of the district were so dangerous that even the policemen didn't want to enter, they killed many cops there. Same happened of 2 or 3 areas of Barcelona.
But this was back in the '80s. Over the years the local community and the city hall (even though our mayor wasn't Mike Haggar) did a lot of community work helping the poor people, improving the quality of the houses, did a lot of (free) sports, culture, education, social activities, and social work of all kinds. Thanks to that (and well, many of these problematic guys moved to other places, died or ended in jail) right now this district is very peaceful and safe even if still there are a few bad guys and minor drug issues (like in any city), way safer than the center of Barcelona, where (non-violent) ninja pickpockets may steal your wallet or phone without even being noticed by you specially if you -like myself- look like a tourist (I'm Spanish but blue eyed blonde, not super common here).
Like in other areas of Barcelona, in that district now gipsies are totally integrated into the society and are almost impossible to differientate from the other people. The stigma is basically almost gone because now there isn't a specific dangerous area full of very poor people, drugs and so on, and people, don't live on ruined houses etc., everyone gets free education, free health care, and so on.
Now that stigma relies maybe in young guys who come from North African countries, but they are way less and aren't excluded into a specific ghetto, so it's easier to integrate into society many of them because even some of them being homeless they have a better environment around them which isn't full of poornes, drugs, violence and so on.