Blacks and Muslims are untouchable. Poles are white, European and Christian, and thus fair game for criticism. You could say that they're the politically correct way to be politically incorrect.
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Britain now has almost a million Polish residents. For that to happen in barely a decade-and-a-half is both bizarre and astounding. As is often pointed out, that is between two and four-times as many people as the number of Anglo-Saxons who are thought to have settled Britain in the sub-Roman period. There are towns such as Boston, a famous name to Americans of course, which are small and fairly irrelevant but also once homogenous and typically English. One in five citizens is now Polish. In other areas, such as the city of Kingston upon Hull (flattened in WWII, one of the most deprived places in Britain, and twice voted the worst place to live in the country) now have street after street of 'Polski Sklep'. Sometimes these don't even serve an actual community, but rather a nationality that functions much like the ship of Theseus. I.e. Poles come and go, but the Polish always remain. Many of these Poles are young men who speak no English, who act much like football hooligans abroad. Except, unlike foreign football hooligans, they don't leave at the end of the day. They loiter on the same street corners, tin of Tyskie in hand, drunkenly fighting and shouting mangled English phrases like 'I your eat pussy' at schoolgirls. It's hardly conducive to a healthy mingling of the natives and the incomers.