Why are Poles always so miserable? Why do they never smile?

Merged:

Polish people behaviour with strangers?

Says a Scandinavian: "There is also a complete lack of small talk - even more than in the Nordic countries, although we are supposed to be the silent ones ;)"

Is it true? Would a cashier in Stockholm smile more than one in Warsaw? I found Czechs very cold and standoffish but Hungarians come off as nice and open. Slovaks were in between. What about Poles?

In the public sphere (shops etc), and especially those in cities there's very little bonhomie. Shop assistants even argue with customers.

Similar in Berlin and Prague. In Western Europe shopping etc is a more pleasant experience.