This person must be from Chicago if they are describing their tomato casserole as a pizza. If Chicago can have their pizza crime, let others do as they please and get off your high horse.
Let's not even get into how overrated New York pizza is.
Chicago people can never believe that anything they have could possibly exist anywhere else, or, even worse, have pre-existed the Chicago version, which is usually exactly the same or slightly worse.
You can observe this in the wild; just start doing literally anything with a person from Chicago and at some point they will stop and mention "this is nice, but in Chicago we have..." and then go on to describe the same thing.