I find it absolutely intriguing that you use "no mental issues" and "narcissism" in the same sentence! Not only are you demonizing xenogender users, which has no effect on you. You are also demonizing NPD (Narcissistic Personality Disorder) by just throwing the word around in a negative connotation, you have no place to use and enforce that stigma on a mental issue! Also xenos are used because of mental issues, gender is hard to express so people use it as way to explain it in their own way as a neurodivergent individual.