I think you're misunderstanding. Yes, it cannot fit in when it's angled properly to fit into the hole. However, if you angle the plate 45 degrees and lift one end of the plate, it will fall into the diagonally. That's why manholes are round shaped. There is no angle for a round cover to fall into the hole itself.
Is no one else going to talk about how weird it is to see a square manhole cover? Now there's a risk of dropping the cover down the hole due to the shape.
I'm usually against frivolous cases like this over nothing, but if he actually did measure that it's impossible to hold 24 oz in a cup labeled that way, then he does have a good case. I think the case would be more on the supplier that provides the cups to Cinemark though, and less on the theater that's taking the word of the supplier.
Taylor Swift. She started out as a country singer, completely changed her genre, and became a pop sensation.
Edit: Nevermind, her first album was in 2005 I think.