Shops are the best places to witness silent hostility (a nice paradox).
it varies and i am happy to see it is getting better and people are getting friendlier. a lot of times yes, you will be treated like any other customer, take your shopping, pay and you get a dry "dziękuję zapraszam" but if you smile or make a joke there are high chances you will be met with a positive response. i have to say that everytime i go, year after year, there seem to be more and more positive people around, smiling and welcoming you into their stores, they will be very helpful and try to say something funny. you just have to encourage them. best thing you can do is have the exact change and offer it before they ask ha ha. in my local Polish shop the lady is ever so friendly and she actually doesn't shut up and talks to everyone who's in there :).
Out of Poland Poles swarm together like honey bees looking out for each other. That's what I have seen.
like honey bees? ;) let me put it this way, if you have the honey or they think you have the honey (in place of honey put anything such as money, ability to help out with a job or English documents etc. etc.) they will swarm to you and seek you out and be your best pal. once the honey runs out or they find out there's no honey here they'll act as if you have never met before and like you don't exist. so basically, no gain - no love. this may sound bitter but it is my experience of meeting Polish people in UK and in 99% it proves to be true. i leave 1% for a friend who's been there for 6 years and never let me down. as a rule i am very careful about meeting Polish people around here, I even have a Polish neighbour and as soon as she found out I was Polish (mail delivered to the wrong door) we kind of avoid each other, guess she had some crap experiences too. i am happy to chat and get to know other Polish people but it so often leads to a hidden purpose, a question that you know they will ask about something to do with their agenda that really, most of the time i just don't bother. i can't recall if i ever met anyone British, Asian, European where one of the first questions they would ask about me was 'how much do you earn?' and Polish people ask this notoriously, as if it's a competition. if these Polish people arrive together or are related they will stick together like glue and only let other Polish people in if they can be of any 'assistance'. i would really appreciate not being attacked for this paragraph, i am willing to bet that most Polish people living abroad will have similar sentiments.