I know this may sound a little crass but can't the TG community in Massachusetts simply agree to use the toilets associated with their birth gender?
It's only a toilet after all.
I realise that some may claim this offends dignity, and I don't disagree.
Quite frankly, I don't see why we need separate toilets for genders. I know that men don't go in flashing their genitals. If they do, in the UK at least, they get arrested.
Women, generally, take longer to use the toilet so, in busy places and events, it isn't unusual to see queues of women waiting, while the men's is almost empty.
This could easily lead to a breakdown in the sex deemarkation in Toilets, which can only be a good thing for everyone.