In my own experience living in several countries in Europe, the more the flag waving the more national delusions of grandeur and xenophobes in a country.

Also, lets not forget that the Far-Right are the ultimate flag shaggers.

The place more obsessed with the flag that I lived in was Britain, and they left the EU on a campaign based in large part (maybe even mostly) on xenophobic arguments along with some serious delusions of grandeur (expecting that, because of how important a country they thought they were, in the Leave negotiations the EU would just give them the same rights as before but without the duties) plus the Press and Politicians over there relentlessly push the "Great Britain is an important country in the World" and "We know best and foreigners can't do things as well as us" spins on international affairs. It's so extreme that to spot the Far-Right from the rest of the flag shaggers you have to look for the ones using the English flag (those would be the far right ones) rather than the British flag (though, granted, the common people tend to have the flag on things more than to wave it)

Meanwhile in the smaller countries I lived in, there is very little flag waving or usage by common people outside the Far-Right and the period of the World/European Cup (in soccer), and the same for Germany even though it's a big country. People don't just plaster the flag on everything and outside the international soccer championships pretty much only official buildings and far right demonstrations involve flag waving, and the Dutch even go further and use orange flags (the Royal family is the "Orange" family) for soccer rather than the national flag.