But the idea is that everyone can open their own and run it by the rules they want. If you or a group don’t like how one thing is run, there is freedom to open up the same thing but make it open for all. This museum is a private one, rather than run by the government, and therefore they can do what they like. The government ones should be open to all because they are elected by the public.
I’m not at all in favour of forcing everyone to comply to uniformity for the sake of inclusivity but I’m all for ensuring that there are spaces available that are inclusive and that there’s freedom to operate how you like, provided that it doesn’t hurt anyone.