Why does my friend try to talk about my insecurities in conversation?

My bff tries to bring up my insecurities (that I’ve never told her I have) in conversation randomly. We were hanging out the other day and she pointed out my big forehead and said “I know you have insecurities.” She then compared it to her own factual features. She did it since then as well with another insecurity of mine that I haven’t told her about. Wtf? Am I right to be upset?
Why does my friend try to talk about my insecurities in conversation?
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