How do you I deal with a person who complains on social media about me?

So my current roommate instead of talk through issues, decides to vent about me on her social media Instagram story. It’s so annoying and she does it about the smallest of things despite not being a perfect person herself in the house. The kicker is she doesn’t have me on social media but we have a mutual friend who lets me know she says this.

How do you I deal with a person who complains on social media about me?
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