what baring does it have on day to day life what gender someone else chooses to be?
I think if it had no bearing, 99% of the posters here would be delighted to never talk about trans people ever again. There are so many more useful and interesting things to talk about. Maybe the fact that we're spending so much energy of this topic indicates that it very much does matter what gender someone chooses to be (although note we are saying you can be whatever gender you wish but you shouldn't have access to female safe spaces)
If you are a Muslim woman living in a strict community, you might have your freedoms restricted if you suddenly can't use a loo anywhere public that is designated for only those with vaginas. Can't use a public loo? Can't work, can't venture out the house for more than a few hours, can't attend social events. Risk of bladder infections if you push it and go out longer than you should.
If you are a very vulnerable woman in prison who has been used and abused your whole life, people being free to choose their own gender might mean you are suddenly forced to shower with someone with a penis and at worst you are at risk of assault (women have already been assaulted by trans woman. It's happened. In female prisons)
If you are fleeing domestic abuse after years of serious sexual assaults, you might find yourself sharing a refuge with someone with a penis even when you're petrified of anyone male-bodied, if people can choose their own gender.
Come on op. It's fairly insulting you've put this post up when this has been addressed a hundred times over. The 'transphobic' women here are educated, often leftie mums by and large (not exclusively). Some are lesbians. Some have experienced abuse. Some have close trans friends. Doesn't that say anything to you with regards our concerns?