And even with that, it only cost Williams a point (and only then because of her earlier unsportsmanlike conduct). Williams's continuing tirade against the official and her disrespect for the sport -- buoyed by the crowd better suited for a rugby match in this instance -- is what ultimately cost her a game point and the match. I say, "Bravo" to the officials for officiating in accordance with the rules of tennis.
As for the crowd, again I’m not a tennis fan, but I think the US Open crowds have for decades denigrated the decorum of the sport and this is the culmination of years of treating the game with disrespect.