Tl;dr
I think it's ridiculous, myself. The solution to every problem in the world is not to sue people, and their claim - "emotional and physical losses" - has no basis. What physical losses? Did they lose money or personal possessions? No. Were they physically harmed in some way by difficulties with access? No. And "emotional losses" is, I would venture to say, frivolous in the vast majority of lawsuits, and what you sue for when you realize you really don't have a case on anything else - or when you want to tack on a bit of extra money.

Stuff's out of your reach? Ask someone to get it for you. Can't get into the theater for instructional workshops? Get an employee to show you how to use something. If the barriers are insurmountably serious, talk or write to management. The culture of lawsuit-as-first-resort is just silly.