I’m sorry, why do you consider it offensive?
If a woman is fat, she should be called out on it. If she doesn’t find it offensive, there’s no harm. And if she does consider it offensive (and if she is, indeed, fat), it should be a nice incentive for her to stop shoveling food into her mouth and exercise more. Fat shaming works and does wonders: look at recent picture of Amy Schumer where it looks like she finally made a half-decent attempt to lose some weight. She’s still over-weight, but out of obese territory.
We live in an age, where a major political figure can win elections with a single hilarious (and historical) joke about woman’s weight.
Watch closely as women in the audience roar with laughter as Rosie O’Donnell gets demolished for (among other things) being a fatso.
Hopefully, we’re coming closer and closer as a society to a state, where calling out someone for being fat is not only acceptable, but applauded.