Keep in mind that 1990s marked with expulsion of Serbian minority and Croatian-Serbian bloody and brutal war is still a painful subject, but generally there should be no problem if you approach that topic with respect. Do not mention WWII holocaust, Jasenovac concentration camp or Croatian nazi past. Visitors will find that domestic politics and European affairs are everyday conversation subjects in Croatia.
Socially, displays of affection among the younger generation are the same as Western European standards, but the older generation (over 65) still are quite conservative.
When driving on rural roads, particularly where a driver has to pull in to allow you to pass, it is customary to wave a thanks to the other driver, by raising your hand from the steering wheel.
Most Croats will respond to "thank you" with something along the lines of "It was nothing" or "not at all" which is equivalent to English "Don't mention it".
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