It depends what you do. If you're drunk and loud - and in their opinion, disorderly - then it's a trip to the drunk tank. Don't forget - it's your word against theirs. Showing up at the embassy with complaints quite frankly won't get you anywhere - the embassies have heard it all before - and they're not going to get involved where it's an open-and-shut-case of drunkeness from their own citizens.
They won't assault a foreigner, but they'll have no problems with taking a foreigner to the drying out clinic if he's clearly drunk and disorderly - or is found slumped and drunk somewhere. That includes taking someone there by force - and as this is the law in Poland, no embassy is going to get involved.
By the way - the standard fine for a stay at the "hotel" is 250zl.
Not that all police take no ****, but that you shouldn't be hassling authority's in any country, especially where your a guest.
Very much so in Poland. The thing to be careful of in Poland is that sleeping drunk on the street is case for them to take you away, unlike in many other countries.