It had the opposite effect on me, the repetition was like joke compound interest getting funnier the more it was drawn out, and on a 2nd layer also it's sort of meta-funny because he's getting away with sticking with it too.

Also I think the joke is Scottish agnostic, it would have worked for me in an accent, if I'd have seen an American doing it, and insisting to stick with it, it would still be funny. Wouldn't feel out of place on "I think you should leave right now".