Brits do the same. At best it is a dialect at worst an accent. A lot of (most of) Scots is still English but spoken with different grammar or unfamiliar phrases and unfamiliar pronunciation.

Sort of like extreme cockney rhyming slang or for a more modern example thick BME* full of slang.

* = British Multicultural English, think fam n blud, lots of Jamaican english influence plus south east asian influence.