Medically transsexual is a subset of transgender. That's science speaking. Textbooks and shit. So all Transsexuals are transgender, but only some transgender are transsexual.
Similar but different, sometimes.
Pop Psychology is assholes trying to superglue a sound bite to the zeitgeist from a new book they just wrote to sell that book and make money. That's where these words come from. Doctors crediting and discrediting each other trying to sell more books than each other to pay for trophy wives and topshelf scotch.
What you are talking about however is political language which is a horse of an entirely different colour. Don't confuse political language with politically correct language. In this context, Political Language is when you label and define a group, while Politically Correct language is later when you rename a group after the official comfortable terms have transformed somehow into hatespeach, and distance is required.
(I'm talking out of my ass.)
Similar but different, sometimes.
Pop Psychology is assholes trying to superglue a sound bite to the zeitgeist from a new book they just wrote to sell that book and make money. That's where these words come from. Doctors crediting and discrediting each other trying to sell more books than each other to pay for trophy wives and topshelf scotch.
What you are talking about however is political language which is a horse of an entirely different colour. Don't confuse political language with politically correct language. In this context, Political Language is when you label and define a group, while Politically Correct language is later when you rename a group after the official comfortable terms have transformed somehow into hatespeach, and distance is required.
(I'm talking out of my ass.)