[ohkine]

> 'Radical' is synonymous with fundamental

That is not at all what 'radical' means in the context of 'radical sub-culture'. The definition you're looking for is one of:

2. thoroughgoing or extreme, especially as regards change from accepted or traditional forms: a radical change in the policy of a company.

3. favoring drastic political, economic, or social reforms: radical ideas; radical and anarchistic ideologues.

I guess you could argue that trans people fall under definition # 2 from the perspective of many (most?) people, but i also think that 'radical sub-culture' generally implies some kind of conscious action — i don't think that simply existing as a member of a minority makes you inherently 'radical'.

[anigbrowl]

I'm not looking for a definition at all; I'm perfectly comfortable with the primary definition of 'of or going to the root or origin; fundamental.' I'm not going to dispense with perfectly reasonable vocabulary just because alternative interpretations of a term exist.

If you're not sure what someone means, consider asking them rather than complaining about it. Transitioning to a different gender from one's birth default is (for the time being) a radical change involving extensive medical evaluation, a lifetime drug regimen and ultimately major surgery, to say nothing of the social difficulties.