Each case may have something in common, but they are different in other more significant ways.

Gibb indicates he dislikes the term, but my impression from my experience with Americans, is that is a personal preference which is not that widely shared. "Yank" has a great deal in common with "Brit" - not a term I particularly like, but most British people seem fine with it, and it would in fact be seen as pretty absurd to object to its use. And, like "Yank" ( I strongly suspect) it was probably an expression originating in the country referred to.

Both very different in those respects to most of the "comparable" terms that have been mentioned.   And for me that difference is what makes all the difference.

But I suspect we're going to continue to disagree on this.