what about polish extremists?
There was just one case of really life threatening violence in BiaĆystok, when they put entrance door of a house on fire. But the door was extinguished and nobody got hurt. Other worst case which you can expect is that they will beat you. But it's rather unlikely. Poland is not Pakistan and it's save here. I've never heard about killing because of race.
But I also think that for a Muslim Dubai or Turkey should be better countries. For example we don't have Ramadan in Poland and it may be unpleasant to fest while everybody around is eating.