Extreme ideologies
That gender identity overrides sex in all instances, that sex is a spectrum not a binary (nobody go there in dragging people with DSD's into it, they have asked not to be weaponised by queer theory proponents), that males can become female on the basis of a self-declared identity, that gender 'euphoria' (ie a fetish) makes males vulnerable and also makes them female. Etc.
These are all extreme positions.
A more moderate positions set out this:
Sex is binary. People are either of the class that produces small gametes, or of the class that produces large gametes. Some people are born with DSD's, which may make their sex initially ambiguous. They still have a binary sex. All people should have the right to present as masculine, feminine or neither, regardless of their sex. There is no right way to be female, other than to be born female, and there is no right way to be male, other than to be born male.
Some people, for reasons we don't yet understand clearly, but which may relate to trauma-based effects on the self-perceiving part of the brain (but equally, which may not - we really don't know) experience distress about the fact of their sexed bodies.
In a minority of people, this distress is ongoing, extreme and intractable (in other words, nothing seems to help with their distress - not mental health care, not social support, not support to process trauma). Some transwomen in this category of having persistent and intractable dysphoria talk about it as being a form of deeply internalized homophobia.
For these people, we have some very primitive treatments. Basically, we can offer medical changes to the body itself, and social changes, in the form of allowing male to present as female, or vice versa.
This is a serious, life-changing step, and should be a treatment of last, not first, option.
For people with intractable, persistent gender dysphoria, who have no option but to make hormonal and surgical transitions, we should minimise the discrimination they face to the point at which doing so starts to infringe on the rights of other vulnerable populations ie women.
That's an actual, moderate, reality-accepting, gender dysphoric person- accepting position.
People who claim a trans identity but do not suffer from gender dysphoria, or who have gender 'euphoria (ie they get off on it) are of zero concern to me, other than that all people have the right to present in as feminine or masculine way as they wish. People can cross-dress or dye their hair pink or put on dresses, or wear men's shirts or paint their faces or their nails pretty much to their hearts' content, as far as I'm concerned, but their psycological wellbeing does not rely on me considering them as the opposite sex, and so I don't.