Why do men call women "fat" as a default insult?

cipher42
I've noticed that men (and some women even) seem to like using "fat" as an insult, even when the person they're talking about is clearly a normal weight. Like, when men get rejected especially they retort with shit like "well you're fat anyways", even when they were just hitting on the woman who rejected them. And even when men just don't like a woman, they seem to default to "fat" as their go-to insult. Why do men do that? And do you think it's justified? Does it say something negative about our society that being fat is apparently one of the worst things a woman can be (since this insult does seem to be primarily applied to women, not men so much)?
Why do men call women "fat" as a default insult?
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