I'm going to take the moral stance here that even if you actually are making a factually correct statement of fact it is wrong to make prejudiced / racist comments. "Roma are __", "black people are __", "Mexicans are __", it looks like you're playing a racist version of mad libs to the wide-eyed people listening to your hate. And no, I don't give a damn about your personal experiences with ethnic group X, Y, or Z.
Let's keep it civil, folks.