While I thank you for posting this, it is entirely irrelevant to your point that being 'transgender' will be just like being 'homosexual' understanding in the future.
To be very blunt and very clear.
Being same sex or both sex attracted requires no person to believe anything that is not based in material reality about the person who states that they are same sex or both sex attracted.
Please name one thing about same sex or both sex attracted people that they wanted people to know that is not based in material and objective reality? There is no demand to believe that a human is something that they are materially not or that relies solely on a belief system to support.
And then please name one right of other groups that same sex or both sex attracted people demand that is not available to heterosexual people? Because I don't recall any demands that were for greater privileges than any other group, but I might be wrong.
"but the pushback against both usually comes from the same place…fear…. misunderstanding, and basically discomfort with anyone who doesn’t fit the norm."
This above is also a misrepresentation of the majority of the 'pushback'. It is not coming from 'fear....misunderstanding, and basically discomfort with anyone who doesn't fit the norm.'. The majority of the pushback is coming from people who don't believe that a human can change sex and who don't believe that a male person becomes in any way a female person - either through extreme body modification or through legal certification.
It is this affirmation of belief that are the additional privileges that a group of transgender people (not even ALL transgender people) are demanding.
And there is also a distinct lack of symmetry between the impact on society even between the acceptance of female people who claim to have a transgender identity and male people who claim to have a transgender identity. As is the lack of symmetry between the motivations for the majority of female people declaring a transgender identity vs the general group of male people.
In addition, there is also very different concerns about the health and wellbeing between male and female people who have declared transgender identities.
Hence, making false negative generalisations about "the pushback against both usually comes from the same place…fear…. misunderstanding, and basically discomfort with anyone who doesn’t fit the norm" is not accurate at all. It could be said to not even be accurate to describe the 'pushback' for half of the people expressing concerns, valid or not valid, about people who claim to be transgender.
What statements such as this negative generalisation come across as is an oversimplification. Which is the only way, ie. very superficially, that your claimed comparison works.