I live in Poland and have immigrant friends. Rest assured there is very real physical violence towards migrants from both former Soviet Union countries as well as Western countries.

You have to watch out for your safety all the time. Just a few weeks ago my friend's bf was beaten up along with several of his friends in Warsaw. The police has done nothing, the embassy has done nothing (they are from on the biggest Western EU countries). You won't read about it in the newspaper either.

Not surprised at Poland being unsafe for migrants, having an elected conservative government that recently banned abortion and is currently also having a row with the EU over who's laws they should enforce first.