What should you do when somebody says you are not beautiful?

my besties today told me i want to tell you something but do not be sad you are not beautiful only with makeup I shocked ,! But i see myself beautiful with or without I don't know why she told that ;( I wish i told her at least i am not fat because she is very fat but i do not like to hurt anyone but she did to me
What should you do when somebody says you are not beautiful?
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