Aye.
They are not necessarily even foreigners, even though I know there's more chance I'd get on with them if they are. People I socialise with are for the most part Scottish, but in fact they are almost all half Scottish and half another nationality and/or they were born or raised elsewhere.
I guess this is still enough to make people categorise them as different, and not part of the mainstream local culture, due to the microcue of them having a background that's even a wee bit different.