Brazil’s first lady, Janja Lula da Silva, swore at billionaire Elon Musk during a G20 social event on Saturday at which she spoke about the need to regulate social media to rein in misinformation.

A ship’s horn sounded as she spoke and she joked, “I think it’s Elon Musk,” before adding, “I’m not afraid of you, fuck you, Elon Musk.”