We have had gender neutral bathrooms for some time now.
They’re called Port-A Potties.
Port-o-potties are unisex (although not always). I believe we are talking about restrooms where more than one person enters at a time. If the government, schools, businesses, etc. want to cough up the money to provide numerous one-stall bathrooms, I have no problem with that (of course if it’s governmental money we’re actually the ones who are paying for it).
But don’t call them “Transgender Bathrooms”. There is no need for that label outside the door other than to push an agenda to make this normal on the rest of us.