I apologize in advance for (possibly) contributing to a debate that has stopped some time ago, but I have something to say.
Then they could discuss it, they don't need someone jumping in to defend them, they can do it themselves.
In theory, this argument is good. The practical problem is, many work that feature gender/sexual minority characters are just satisfied with playing it vague and never make the said character come out in dialogue or monologue, not even thinking to themselves "oh so that's why. I like girls / I'm not a boy as they say I am / etc". So, how should readers discuss this kind of characters? Should they treat them as [some gender/sexual minority]? Say, the one character that behaves like transgender in every aspect (even suffered from someone outing them) except they didn't proclaim it themselves?
And then we have societal and cultural differences. For example, I heard that in Japan, the people that's socially accepted as transgender (the ones that would be met with "ah okay you're indeed trans" instead of "no you haven't done xxx you can't be") are those that have completed bottom surgery. So characters that have not met the additional bars in their societal context (but otherwise met the definition of LGBT+ in western culture) would be even less likely to come out to people/themselves. What now?