Girls, Why are flat chested women often ridiculed?

Anonymous
Like women who are A cup or less seem to get a hard time. For example a woman at my work in her 30's who has no boobs. The other women in the office all call her ironing board behind her back. When she was in the room today they were playing a game of who could sneak into conversation with her the most small boob terms. 'Did you have friend eggs for breakfast' kind of thing.

The game isn't a regular occurrence but the nickname is. I feel being a flat chested woman must be like being a really short guy or something. In terms of the ridicule you get.
Girls, Why are flat chested women often ridiculed?
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