The image posted last Wednesday featured the mum-of-three relaxing on a seat with the caption: "Feeling it until I see the pic and see my crazy arm. Maybe next time I shouldn't lean so hard 😂 .”
Several Instagram users suggested that the 30-year-old should be less harsh about her appearance.
Cavallari clapped back at one since-deleted comment, replying: "I didn't say my arm looks fat, did I? No, I simply said it looks crazy (and I was joking around) because if I didn't say it, a thousand other people would have.”
"If you took it as I was being critical of myself, then that's on you. I was in no way putting myself down nor am I upset about it in the slightest (obviously I posted it). How you interpret my words has nothing to do with me or what I actually meant."
In another comment she suggested her followers lighten up.
"What I said was very tongue in cheek...hence the '😂'. Everyone needs to relax and have a sense of humour. I never once said I think my arm looks fat. And sorry, but I actually do think I am a good example for young women [redacted] . I would never put someone else down over the internet for starters..."
If you come for Kristin, she'll come for you.