Most of us believe the whole idea of gender identity is ludicrous, so you can't talk someone out of something you don't believe exists.
If 'gender identity' is going to be written into law, it needs a clear definition.
On another thread last night (the cisisnotaslur one) we had a new poster telling us (yet again) what gender identity isn't (according to them it's not the same as gender expression and it's not about stereotypes). But as is always the case with these posters, as soon as they were asked 'well what is it then?' they disappeared. Because they can't define it in any other way than feelings about gender woo.
The government need to come up with something better than this transactivist line about what it isn't, and better than the Yogyakarta definition which is a mix of feelings, stereotypes and expression:
each person’s deeply felt internal and individual experience of gender, which may or may not correspond with the sex assigned at birth, including the personal sense of the body (which may involve, if freely chosen, modification of bodily appearance or function by medical, surgical or other means) and other expressions of gender, including dress, speech and mannerisms;
There is nothing there which tells me how I would know what my 'gender identity' is or convinces me that I have one.