“What do you do if your friend(?) secretly took photos of you and your other friends and posted them on the internet and someone responded to it and said something racist about you and she laughed at it and shared it in your group chat and are trying to make your friends believe that she had no bad intentions when posting it but she knows that one of your other friends is insecure about her appearances and she still posted it??? (ik this is a long one but genuinely i don't know what to do)”
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Someone answered with kindness...
I might suggest starting to look for better friends. These people might call themselves your friends, but they sound toxic.