Friend is scared of being fat

A very recent friend posted on social media that her biggest fear is to be fat. This is a person whom I met fairly recently and became friends with, just a few months back. I also know for a fact (from her sharing life experiences and old pictures) that she’s never been fat in her life, or even slightly heavy. In fact, most people would consider her very thin, now and before.

Things like this make me wonder how the rest of the world perceives me. Is that what she thinks when she sees me? “I’d hate to look like you”. I even started considering stop being friends with this person. I know this post is not about me, obviously, but it does say a lot about her values and what she thinks is important in a person. Am I overreacting here? My therapist says that is just her own thoughts that have nothing to do with me, but I don’t think she truly understands the feeling, considering she is a thin woman too. I’m just trying to figure out what other people with similar experiences think about this.