Using their line of thought "intersex person" will become problematic as "inter" means "between" which presumes two fundamental sexes and that "intersex" therefore isn't a fundamental sex.
Retarded people like to come up with a new word for retarded people all the time. It’s retarded.
That's already a euphemism.
Neury people like to come up with a new word for neury people all the time. It’s neury.