How do I deal with catty coworkers?

there's this new chick at my workplace, she would talk behind people's back who were mean to her. Recently I didn't even do anything to her and she got mad at me. We used to be cool. Her and my other coworkers would get together and kind of talk behind my back or they would talk loudly to me like i am deaf.

How do I deal with catty coworkers?
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