The steelman version is something like the following chain of reasoning: (a) gender identity is something that everyone has that is distinct from sex, (b) with enough introspection, everyone can discover their true gender identity, (c) if you don't have a strongly felt gender identity, you need to introspect, (d) if introspection does not yield certainty then this suggests genderfluidity, or even worse that puberty ought be delayed until certainty is achieved.
Or how about: an AMAB child playing with a Barbie doll often is strongly suggestive that he might actually be trans.
Or how about: values like "being on time" or believing that a math problem has one correct answer are inherently white supremacist and racist.
etc.