If we stare at you it is mostly because we are curious.
Or because we want to beat you up but thats relatively rare.
1. 99% of people in Poland are white
Which means EVERYWHERE you go you will stand out and be stared upon but hey dont be nervous, we're just curious.
In general as a black in Poland you would have some tough time
A lot of it actually.
as a black woman you should be veeery careful (because for some morons you would be kind of delicacy)...
Loads of drunks and chavs are curious how is it with black chicks and will want to rape you the moment they dont beat you up or mug you or stare at you.
(of course only if you are really nice to them...)
Basically you have to suck up to ancient crones so they treat you like they treat everyone who's white.
There's one group that will be incredibly helpfull actually, you will recognize them easily, they're bald young men in army boots and puffed jackets, if you see them make sure to walk up to them and say hi.
If you avoid streets, people, his family, going out alone, you should be ok, there's no reason to be nervous.