[Grayskull]

In czech republic state flag is not always displayed. Some schools have picture of president in classrooms but it is more of a rare sight. Also there is a separate subject about topics ranging from state symbols to law creation. so yes it probably is US thing

[mrex]

It's interesting that in the countries where it seems to be less common, everyone assumes that displaying flags outside of schools is a US-only thing, when spot checks of Google Maps seem to suggest that it's relatively common throughout the world.

Americans get a lot of flak for assuming the world looks like their backyard, but maybe this is a case of the reverse?