I think I can see where you’re coming from with that criticism, but if I’m right then my error was an insufficient example.

I would count “I like Elbonia because we have the best mud farmers in the world” as patriotism. It may be untrue (which is a separate issue), and it may be chosen post-hoc as the only way to stand out (ditto), but it doesn’t imply other nations are no good at farming mud.

I would count your quoted example as nationalism for the same reason I would describe "I like men’s football because it is comprised of the superior male race" as sexism, while I would say that “I like men’s football more than women’s because I sexually fantasise about men and not women”, isn’t.