The thing I don't like about people challenging someones definition of their identity using the term "transsexual" is that, to me, it becomes a clear challenge to the identity of that person.
I'll use myself as an example. I don't identify "as" a transsexual, but I will happily use that term to describe myself because of the situation. I was born with the physical body of a genetic male, and I consider myself, my brain, my identity, to be female. Hence I transitioned socially, as well as taking the medical and legal steps, to live my life as female. Not too difficult to understand. The term fits, I'll use it to describe my situation rather than launching into a lengthy monologue in attempting to explain my particular situation. I dont think it matters one bit when I transitioned, what I want to do with whats between my legs, any more than what I had for breakfast yesterday, as to whether I am allowed to use that term to describe myself.
I use the term in the sense that it is a simple term that implies that I ID as the other binary sex to which I was not biologically assigned to at birth, and wish to live my life as a member of that sex. Now, I could really care less these days if anyone feels the need to imply, for whatever ridiculous reaons they want, that I can't call myself transsexual, I'm pretty stable and secure with my identity these days - a few years ago though, when I was still depressed, alone, desperate for acceptance and understanding from people I thought felt the same way as myself, someone challenging my use of the term meant something altogether. To me it felt like a direct attack on my identifiying as female - that I wasn't dysphoric enough, that I wasn't comitted enough, that I wasn't allowed to call myself a woman because here these people are, who call themselves women or men and also call themseleves transsexual, telling me that because of this, or that, I'm not like them so I'm not transsexual. I can call myself a transgenderist if I like - and I should feel perfectly OK with that.
To someone searching for acceptance, the last thing they need is an attack on their identity from those they see as sharing the same identity. It's cruel, it achieves nothing. So stop it. Challenging someones identity when the cold be in a vulnerable state and needing support is only going to either annoy people, or make things a hell of a lot worse. It's not going to help.
Megan