Why do friends post unflattering pics of you?

My friend seems to only want to post unflattering or weird pictures of me on her social media, any time it’s a nice picture or I look really nice it doesn’t get posted. But if it’s an ugly one she posts it even if I say I don’t like it. Why do friends do this? :( do they think it’s funny?
Why do friends post unflattering pics of you?
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