[user104658]

TBH I think there is something psychologically different about choosing to fly your home country's flag on your wall (indoors) when you're an expat living in another country, and choosing to do so when you still live in that country. I can see myself having a Scotland flag on the wall if I moved to Australia. I wouldn't have one on my wall... here in Scotland.

I don't think it necessarily means anything but it would definitely make me question what message is being sent.

If I see a Union Jack on a Scottish house I immediately think it's a Unionist message. If I see a Saltire I assume it's a pro-indy statement. When I see a Union Jack in England... pre-2017 I'd have assumed just a Royalist type, post 2017 I unfortunately automatically go to Brexiteer.

Sometimes those assumptions will be wrong but human beings are pattern-seekers. It'll often be correct.