They can do nothing, once someone calls you 'racist' you're racist for good.
I don't know the details of the story, but the thing is with baseless accusations of racism is that it's a perfect slander, one can never prove innocence once proclaimed guilty.
What are you trying to say? over 16 people are just lieing! Whatever dude, you're privilege to not have to face the bs. Then why don't you go get the details before you start talking smack