While there can be genetic aberrations that make a very small minority people difficult to tell whether they are male or female, that is not what transgenderism has evolved into today. It is about how you feel, completely subjective, based on no science and facts, and constantly shifting.
Yet the Left is trying to enforce it as law. Which brings two problems:
1) If you can identify as something with no facts or science to back you up, then it makes basic definitions meaningless, and the law even more so. If you can simply skirt around something you don't like by claiming to be something else, even very transiently, everything then becomes completely arbitrary, and no one has any solid legal foundation to stand on.
2) If we are truly going to apply the 14th amendment to such a situation, all people that claim to identify as something, such as trans-racial, trans-ageist, trans-species for example, has a legit claim under equal protection of the law.
At that point it's complete anarchy and societal breakdown.