LGBT

Because I am pretty sure it wasn’t a trans person who decided on the label trans and I am pretty sure many would have picked a different term.

And it is funny that you mention the term “sissy” as that is often a disparaging term for a trans person. In fact, I would say more so than for anyone who isn’t trans.

That said, I completely agree with you on your proposal for good manners:

“ask people what they want to be called and don’t make up or attribute names to them based upon your own convenience. ”