Another ad that irks me is the one for Weight Watchers (I think?) where it shows a sad looking plus size woman and the words "Do you feel like you're the only fat woman in the room?" or something like that. Then you hear a song by Cher (who was never fat) playing.
By the way I am 5'5", a size 12 and happy. I know I could be smaller and be the "ideal" weight, but I am not and I don't care to do anything about it.