Sorry on behalf of them! I knew about the tipping culture because my grandfather was a general manager for a branch of a US based multinational company and had to travel there a lot, and my father had traveled a bit to use scientific instruments there (like synchrotrons).

But to the average Australian - we have a very decent minimum wage and ridiculously good penalty rates (like, work a public holiday and you get double time or double time and a half). Tipping is just something that is non-existent, and I think people just don't expect that the US would treat people so much worse than we do...