Is this offensive?

[cherryolives]

For a white person who is British but born in Kashmir to describe themselves as Kashmiri?

He acquired Irish citizenship ius sanguinis through his father.

"Nationality" can also mean belonging to a specific ethnic group. It doesn't just mean "citizen of".

This wasnt about nationality though , it was a joke about spinach which came from the same region both JL and her father were born,