Why does my friend always pick out my flaws?

i have this so called "friend ", that always picks out my flaws. Like everytime we get together she makes comments about my hair saying it looks bad & i need it re done , or she would say im adding weight that if i keep eatin junk ill be fat , she'll point out a zit on my face , make smart remarks of my clothes & much much more. Why does she do this , its quite annoying to be around all the time.
Why does my friend always pick out my flaws?
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