One thing trans people seem to believe is other people want to hear a long detailed description of exactly being transgendered is about. That they want to have CD/TG/TS/post-op/pre-op/non-ops all explained. They don't. It's like if someone says "Oh you're like Chaz", they don't mean they believe you shave every life experience and viewpoint with Chaz, i.e. you are his clone. They mean you basically have done what Chaz did.
What people are interested in a very simple one sentence explanation in terms they can understand. I simply tell people "From when I was a small child I always felt inside I was a woman, so I finally starting living as one." NO ONE has ever asked for more details, they just say "I can understand that". And most say something like "Well if that makes you happy, I'm happy for you". A handful have asked if or when about surgery, which I reply "That's kinda personal" and that's the end of it.
I do like this analogy and think people who took it negative are looking for -other people to see being trans as negative- which seems to be something many trans people believe.
It was very clear to me the coke bottle is the body we were born with and the sprite is what we are in the inside, hence it's inside the bottle. The statement "Why would you insist that what you're dealing with is Coke and can't possibly be anything else?" is very clearly calling for the possibility of being something other than what it might first appear to be.