[Toughy]

I don't get it either. Hell I don't get the problem with 'tranny' but then I live in the Bay Area and hear transfolks call themselves 'tranny' all the time.

The voice reference most likely has to do with the changes in voice that occur with the use of T (and E). Is it offensive to make fun of a teenage boy when his voice cracks as it changes? It's the same cracking/change I hear when transmen start taking T. Would folks be upset if a transman had made the same joke?

There are ways of saying the same thing in an offensive way or in a non-offensive way. I did not see this as offensive in the way he said it....but offense is in the eye of the beholder.