> And in Eastern Europe 25-30 years ago, other adults would have no problem yelling at you to behave in their own language/words.

Nobody yelled at us then or even thought that we were doing something wrong. If you would yell at a kid in a shopping mall for running around like crazy - people would look at your weirdly. It was expected of kids to behave this way in my culture, and still is to this day. This may not be the case elsewhere, hence why I think that there is a heavy cultural aspect.