I think most people would object to forcing women to wear skirts. Beating up girls who do unladylike things like dancing or calculus. Many can even see how silly it is to tease a boy for enjoying painting more than sports.
Most* get this.
What I don't understand is how it isn't obvious that transphobia is the exact same impulse.
There is no "reasonable" amount of transphobia you can tolerate without also supporting rigid harmful gender norms in general. 1/
