What should I do if my family members call me names behind my back?

They call me a loser and the R word when I’m not around but they are nice to my face. Why is my own family like that towards me?

Updates
1 mo
The R word they call me is retarded. And they don’t talk to me all because I have a disability. They pretend to like me!
What should I do if my family members call me names behind my back?
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