Belz...
Fiend God
You are saying that it's about whether someone claiming to be of a specific gender is enough to make that person that gender, which is an odd question.
Why is it an odd question? It's a factual question like any other.
As to your specific problem, the answer is both yes and no. It's enough for that person, and any person interacting with that person on a casual level.
Why do you presume to speak for any of those? Furthermore, the question is objective. It either applies to all or none.
The thing is, we're not talking about just "claiming" to be a specific gender.
Yes we are. We're often told that whatever you feel you are, you are. This is ridiculous on its face, and those who in this thread have said that it isn't the sole criteria for identity seem to agree, but we're yet to see a list of criteria from those who ask _us_ for a liste of criteria.