Yugoslavian.

Unless I misunderstood your point, that is a strange take that isn't close to being true. There is a large overlap of Scottish language enthusiasts who are advocates of both Scots as a distinct language and Gaelic, the demographic of the recent surge of popularity of Gaelic on duolingo are clear.

The overlap between political commentators who both insist that Scots is "just a dialect" and that Gaelic is a dying language that we should discourage is also very apparent.

The subtext is pro indy people are generally pro Scots and Gaelic, and unionists are against both of course.

Scottish English != Scots. The former is just English with a Scottish accent; the latter is a closely related (to English) but distinct language with its own vocabulary and grammar, not dissimilar to the relationship between Norwegian and Danish, or Czech and Slovak.

Scots being a language has nothing to do with suppressing Gaelic. Generally people who hate Gaelic hate Scots equally.

On both sides of the Irish Sea, too. Hard-line unionists in the north of Ireland have been pushing "Ulster Scots" in the last ten years or so. Not out of any real cultural association with the language or with Scotland - they overwhelmingly identify as "British" - but as a tool to diminish Irish-language initiatives. Every time there's a measure proposed to support Irish, they can propose an equal amount of funds for Ulster Scots.

It actually helps them to make the language seem as ridiculous as possible, since the real goal isn't to promote their language but to mock another.