My evidence for that is the fact that they are the only people who have had any problems when I've told them only one person per household is allowed in! And it is also the only group of people who have decided they should shout and swear at me, so sorry, but at least where I am that is the case.That seems a very racist thing to say. I thought that sort of thinking had died out thirty years ago. Have you any evidence for that or is just your view?
Edit: To be clear, by any problems I mean something more than just a little moan or an 'Oh really' style response. And it is still a minority of this group who have very negative reactions, but it is only this group who have.