Why is AGP transphobic? Seems like at best it’s still unsettled science. From the link:

The concept that androphilia in trans women is related to homosexuality in cisgender men has been tested by MRI studies. Cantor interprets these studies as supporting Blanchard’s transsexualism typology.

There’s a loud minority of anti-AI people. Most people don’t reflexively hate it, though.

It can be true that something is both an important right and used unethically by people that don’t actually care about the topic. See Rainbow capitalism as a very related example. Nutomic is right that identity politics are used to create division among the working class, because anything that can create division will be used to do so.