Who knows.
The point is, neither of us can possibly have met every single Russian, Czech, Roma, 'Eastern European', so we can't really say what 'they' are like. That's why IMO talking about ethnic groups or nationalities in terms of generalizations is a bit dodgy. I'll admit my dad does it all the time and I know he means no harm, but IMO the way the Mail does it is kind of encouraging people to see all immigrants from these groups as homogeneous and 'all the same', which isn't great.