TERFs get this in your heads. There is no way to exclude trans women from women's toilets without sexual assault -- tearing people's underwear off. This is what you are demanding, the right to sexually assault trans women.
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And do you really think the people who hate trans women will continue to respect the privacy of passing trans women if they are emboldened by law? Do you really think that no cis woman will ever be accused of being trans?
If they're passing trans women, the people who hate them wont even know they're trans, though?