How did you come into such conclusion? I live in Poland and I do not agree with it. At least in southern part (Silesia, Katowice) we are really happy about the immigrants from east. They are really good workers, they have no problem in learning language, and are really similar when it comes to family and moral values.
I'm not Polish but I've spent a fair bit of time in Warsaw and I'd say the majority of people there are fine with it too - I mean, they complain but I wouldn't say they're actively opposed either. I do genuinely wonder if it might be a generational thing - I've noticed some of the older population aren't quite as happy.
