They steal, fight, do surreptitious shit and don't care about personal hygiene. They also form communes of gypsies that cover for each other, lobby politically and terrorize the normal people living wherever they settle.
If you do something against one gypsy you've done it against all of them and within the next two hours you'll encounter serious bodily harm as 20 gypsies show up in their shitty trucks to kill/maim you. And the cops won't be able to help you because the gypos stick together, don't rat and in small communities people are afraid of them. In short, they're highly ethnocentric.
They are kind of like the black people of europe. However there is no gypo lives matter or propaganda about gypsies yet so Europeans are fine with being truthful about them, whereas they'll talk about racism and that one cool black guy they had a beer with if you do the same about black people.