I think most commenters here are missing the point.

There is a more extreme reaction to transgender people as opposed to gay or lesbian people, because of issues like sports and bathrooms. And that hits at people's sense of injustice. For example if you have a young daughter, a lot of people will hate the idea of a person with a penis going into the women's room and being around their little girl. Or if that daughter grows up and joins a sports team, the idea of somebody who is hormonally male and thus naturally more muscular competing against your daughter is unpleasant.

Put differently, I think a lot of people we now classify as 'transphobic' don't actually have much problem with trans people themselves. Rather, with how the efforts to ensure trans people receive the full treatment of their chosen gender can affect the rest of society.

For me personally, I don't know what the answer is. I generally don't care which bathroom you use as long as you wash your hands. I have no problem with anyone presenting themselves to the world as whatever they wish, if it makes you happier than by all means. At the same time though, I don't think it's transphobic to point out that somebody who is largely or entirely biologically male will have a natural competitive advantage in the field of sports.
So while I certainly don't want to exclude anybody, I think there is at least a little justification for restricting some women's sports to those who are genetically female.

They’re an easy minority to scapegoat. In the US they make up between 0.5% and 1.6% of the population. A sizable portion of straight people associate being transgender as something sick and weird and a sexual deviancy, so it’s easy to target them and to try to associate them with actual objectively bad things (ie pedophilia). They’re just people trying to find their place in the world and live their lives, same as most of us.

Because queerness (trans, gender non conforming, gender fluid, agender, bigender and related) threatens hierarchy.

In western society regardless of how ‘progressive’ some parts of it have gotten, for the majority there’s still a strict hierarchy. Man most important, then woman, then children first boys then girls. Trans people completely disrupt this hierarchy by being able to change what they are and those who cling to hierarchy freak the fuck out over it.

Then there’s the sexual panic, a straight man who’s insecure is gonna freak out if the woman they think is cute actually has a penis.

Conservatives are afraid of change, because they control current status quo. They can't let people escape from that control, so every nail that is a little outside it's hole gets hammered.

In short, they rather prefer trans (and broadly queers) to hide or die, unless they can control them. Everyone different from what they can control is a big danger. Imagine if everyone could be like they feel like? Conservatives see this as chaos, they are the guardians of peace and good values, so anything not already controlled by them is the opposite, chaos, destruction, fire.

That's why they rarely present anything new, their policies and general opinion tend to fight the natural evolution of civilization. USA, as obviously all of the American Continent, was built by immigrants (and slaves). Now they fight immigrants, undocumented ones mostly, because they can't control them. And we know what happened when 'the libs' back then tried to end slavery, you know, other people that they CONTROLLED.

Thanks for coming to my TED Talk.

A lot of conservatives want to simplify life because they have a simple mind.

I support trans people to do whatever they want to themselves but unfortunately one did shoot up a school https://en.m.wikipedia.org/wiki/2023_Nashville_school_shooting

Rural IL here. Full of conservatives.

Nobody here cares if you are trans. Couldn't care less.

Never met a school church shooter either.

Most conservatives I know think it's dangerous to entertain trans ideas in children. They say kids don't know what gender really means because they haven't experienced puberty yet but the most effective time to use hormone blockers is before puberty. So they feel like it's the parents who are encouraging use of hormone therapy for their kids because the parents are brainwashed by left media, and essentially committing child abuse.

I don't encounter a lot of ads but I was just listening to the Economist talk about this one which the trump campaign played over and over again and it struck me as a small window of an answer to your question.

The ad strikes me as cruel but the thrust (and I imagine there's a blend of fact and fiction) is that Harris used tax money to pay for a woman's sex change after being convicted of first degree murder and serving life in prison. They also have Harris saying she was using her power to "push forward the movement and the agenda."

Even for supporters of trans rights, I imagine not everyone loves having to defend using tax money to pay for expensive gender surgery, especially on criminals.

So I could see people, who might otherwise be supportive of trans folks in their own lives, being "against trans people" on an issue framed like this.

https://www.youtube.com/watch?v=l3BXYjoAzq0&ab_channel=TheJimHeathChannel