> if you defend trans rights, you are going to forget more important fights such as the obesity crisis, the opioid crisis, the absurdity of your healthcare system

I don't understand this argument at all.

Lots of people disagree with the Left's proposed policies on these issues, but they do have policy proposals. It's just flat-out inaccurate to argue that trans acceptance has reduced Left focus or fervor about other subjects. If anything it's the opposite, the people who are most likely to be arguing the loudest for trans rights are also most likely to be proposing large changes to our health care system, mass decriminalization of drugs, mass reform of how we police opioids and how we rehabilitate addicts, and public health laws and restructures of our food system. I can count on one hand the number trans activists I know online who aren't fiercely pro-union and fiercely in favor of raising minimum wages at a federal level.

The common argument from USA Republicans is not that the Left is too weak on these issues, it's that the Left is too radical on these issues. I don't know what experience would lead someone to believe that trans activists are less likely to be politically involved in other areas or less likely to support at the very least populist-adjacent ideas. It just does not match up with reality in the US at all.

People can criticize the far-Left activist-sphere for a lot of things, but they're definitely not rejecting populist ideas or cozying up to the elites. It's just a wild argument to make. Ask McConnell if he thinks that people like AOC aren't interested in worker rights or unions. I mean, my goodness, the position of the mainstream GOP leadership in the US right now is that the far-Left is composed of dangerous radicals who want to execute Bezos and give all of his money to his factory workers.

If what you say is the common French perspective about what attitudes are in America, then France is not getting good enough reporting about American issues or how people over here are actually arguing about them.

Similarly:

> adressing some issues means not adressing other.. the public debate cannot handle so many things at once

I don't know how this is being reported elsewhere, but to be clear, it is Republicans who are proposing these bills. More anti-trans legislation has gotten proposed in the last year alone than we had in probably the last decade. Republicans did that, not Democrats. So the idea that this is an attempt to avoid distracting from other issues just doesn't make sense, because if that's what Republicans actually believed then they wouldn't be constantly bringing the issue to the forefront of debates and passing a ton of legislation fighting against trivial issues like what bathroom someone walks into.

What would make the response make sense is if Republicans viewed petty victories like policing genitalia inside of a public restroom as victories in a broader "culture war" in which trans people symbolize a cultural enemy.

Which, look, it's fine. We can acknowledge that some things are a culture war. You bring this up yourself when you talk about the fear that allowing trans rights to progress too far will lead to people who dissent being ostracized. For Americans that is inherently a tribal fear. It is a fight over a change in cultural values and standards: a worry that a certain cultural tribe (often white, Conservative, and/or Evangelical) is losing power compared to other subgroups.