My small fat coworker is like this. I'd describe her as a formerly thin girl that doesn't realize she's expanded yet because she's not too overweight (no such thing as not overweight enough). Anyway, she does the typical fat shit... Calls me a twig, says my hips are small, says her boobs are too big, etc in an attempt to somehow try and make me feel inadequate. Normally I don't give a fuck but it's the way they always try to work it into every interaction with you. Like "I feel threatened by you so I'll make every conversation with you into some kind of contest." Like the female equivalent to a male pissing contest. it's just like... Sorry you feel that way, not my problem.