Most cis women who are against trans women being in "their" bathrooms are either hardcore bigots or trenders. Trans women have been using womens bathrooms for decades and it's only recently people started to care.
Cis women shouldn't want bathroom policing because they could be harassed too for not looking womanly enough. Trans exclusion therefore often overlaps with mysogyny and racism.
Banning trans people from bathrooms often bans them from all but disabled / gender neutral bathrooms. A trans man can neither go to the mens nor the womens. This means many trans people will not be able to go out comfortably, and mah not be able to get jobs where those bathrooms are not available. Because of this, bathroom bans are a disproportionate action that violates humans rights and discrimination laws.
We all know this is an absurd moral panic and the fact things have gotten this far is a national embarassment.

This is a tough one.
Protesting the actions of a synagoge should be legal and protests are most effective outside the organisation itself. At the same time harassment based on identity needs to be prevented.
IMO that law should not exist. Anti-discrimination laws are enough of a tool that you don't need this sort of legislation.