I’ve never heard a rabbi berate his congregation. I know it happened in the past but it is rare these days.
Marc Shapiro replies to my question: “[It is] not very common today, but in traditional societies it certainly happened. They would scream at them and tell them to repent, that sort of thing.”
Another Orthodox rabbi says to me: “Nope, always the opposite, how wonderful they are…”
Another Orthodox rabbi says to me: “No, it is prohibited to embarrass someone.”