Languages.

You've got Scottish Standard English. Possibly with a strong accent. In some areas, people mix English and Scots so there's a "linguistic continuum" between them.

You've got Scots. West Germanic language, descended from Early Middle English. Lots of shared root words, but not fully intelligible to English speakers. Mostly spoken by people in the Scottish Lowlands and some of the islands, including Ulster in Northern Ireland. Potentially just a dialect of English, but more often considered a separate language.

You've got Scottish Gaelic. No relation to English. Developed out of Old Irish, this is a Celtic language instead of a Germanic language like Scots and English.

So the Scottish people have at least 3 languages to pick from to confuse the English.