Asklemmy

Northern Germany here. The German flag is usually only flown at government or other public buildings or, as another commenter said, when there's a special occasion such as an international football match.

Something a bit more common up here seems to be flying the state flag (blue, white and red), which can be seen in private gardens or on some residential buildings.

In Spain it's extremely common to hang the flag on your balcony, especially since the pandemic. It's also quite common to see younger people wearing bracelets of the spanish flag. I'm not really a fan of it but most people don't do it for political reasons, it's just nornalized, so I can't really blame them.

UK here. A UK flag is only flown from govt buildings unless it's some royal event or football but then it's usually the individual national flag such as England, Scotland, Wales, etc

The union flag & the St George cross (Englands flag) were co-opted by the far right in the 70s so flying one outside of the occasions named above had other people mark you as a bit of a nationalist & to be weary of you.

American here. When I was in Sweden it felt like their flag was everywhere. Maybe I just noticed it more because I was traveling.

In Brazil I saw their flag plastered on a lot of stuff - clothes, bags, painted on the street - but not so much flying on flag poles.

I see fair amount of US flags here at home, usually at government buildings, cemeteries, and the like. When flown at homes I usually assume the person is on the political right.