Here's the thing. If someone were to be transgendered (usually it's always MTF), but they dressed conservatively, looked like a woman and sounded like a woman and were not trying to indoctrinate children into leftist ideology, I doubt that many people would care. The problem is things like spikehead or the blue haired commie activists who are men in drag with stubble and deep voices - the only person that thinks that *that* is a woman is the delusional man in drag.
The same can be said for gay/lesbian - when they *aren't* cigar-chomping bull dukes or flaming swish girly-men trying to claim that they're normal while flamboyantly acting out, no one gives a shit. You are a man who looks, dresses, and sounds like a man but you like a deep dicking from your equally-conservative looking husband behind closed doors? Who cares. You want to adopt kids and raise them to be good people who are patriotic, generous, and caring? Great. But we don't need anyone who is LGBTxxx trying to tell children that everything is wrong with traditional values.
People
did use to give a shit, even when they blended in. Gay-bashing and homophobia were a thing, and people were worried about shit like "what the queers are doing to the soil"[1].
That's changed, on both of the two branches of psychopathy we call the political spectrum. And in a large part it's changed because people have seen positive examples. People who were out, or men who wore a dress (whether trans or not; the general public at the time wasn't really aware of those distinctions), but who were charming, or funny, or even... normal. Will & Grace, Queer Eye, Rupaul, and so on.
As a result of that publicity, most people agreed that all those people seem human. So let's give them the same basic rights, and stop panicking.
This is just the next step. So the argument that they should just act normal and people would be fine with it isn't a good one, because the current state is the result of the previous generation
not acting normal and blending in. Instead, the criticism should be aimed at what they do that's wrong, or inappropriate, or over the line. Not on being flamboyant.
[1] Not a specific thing that people believed, but a parody from the Dead Milkmen song, Stuart. Awesome animated version:
https://www.youtube.com/watch?v=71PNZH1OaW0