During the Qatar Grand Prix on Sunday, Antonelli made a driving error, veering off track and allowing Lando Norris to overtake him for fourth place.
Red Bull's Max Verstappen's race engineer, Gianpiero Lambiase, and adviser, Helmut Marko, suggested Antonelli deliberately moved aside for Norris.
Mercedes reported that Antonelli, 19, received over 1,100 abusive comments, including death threats, across his social media accounts following the incident.
Mercedes team principal Toto Wolff strongly condemned Red Bull's initial suggestions as “total, utter nonsense” and “brainless”, clarifying Antonelli's error.