Don Rickles was insanely good at delivering roasts. That was his whole schtick.
When Sammy David Jr was roasted on Dean Martin’s show Rickles qipped about how Sammy tried got on a bus in Birmingham the driver told him to get in the back. Sammy said “but I’m Jewish” to which the driver said, “get off”! Those were the days when most people had the sense to realize they were just poking fun at each other, nothing more nothing less.