Well, my mom's half-Romani, and she said the show's pretty insulting. She also said that the people depicted on it are what her grandmother used to refer to as "Slav pick-pockets." I don't really have much appreciation for my heritage, honestly (my dad's Welsh and Irish; personally don't give a shit, I'm American), so I just take her word for it that it's fairly insulting, and she grew up in the North where there was more emphasis on ethnicity/nationality of immigrants. Here in the south, the rare occasions I've mentioned I'm part-gypsy, I have heard, "Wait, that's, like, a people?" before.
Also, just on a weird personal note, but when my mom tans she just plain does not look white, some of her family including her mom in old photographics don't really look white, and the people I saw on the one episode I bothered glancing at looked, well... white.
I thought "gypsies" was simply a racial slur (and a misnomer) attributed to the Romani because the Europeans during the Renaissance (Middle Ages?) couldn't tell them apart from Egyptians and other Middle Eastern peoples, and the Romani came from areas further east than most immigrants or nomads of the time.
The Rom had no written language. They kept an oral tradition, with lots of loan-words, portmanteaus and some huge differences between groups and geographic locations.
This is basically just stuff my mom reminisced about, and cross-checking Wikipedia it looks about right, but I don't know how really accurate it is.
"The strategic adversary is fascism... the fascism in us all, in our heads and in our everyday behavior, the fascism that causes us to love power, to desire the very thing that dominates and exploits us." Foucault