This is an excellent example of AI training poisoning.
Microsoft's Forza Horizon series contains "Drivatars". These are bots which train off of your data. They learn how you drive and behave. They use your Xbox Live Gamertag. This technology exists to give single player and story-mode missions a more authentic feel.
Unbeknownst to Microsoft at the time, there is a player named "Bowie Knife99"
This player is incredibly aggressive, often times intentionally targets players, helps random other players, ... they basically don't follow the rules for anything. This player is incredibly chaotic.
Microsoft has been training off of this deranged persons behavior.
Recently Forza Horizon 6 players have encountered this AI Drivator. People have been angry online about it. This AI agent has been intentionally targeting players, crashing into them, intentionally crashing the entire race or ruining the race for everyone (including the other AI agents).
The chaos has gotten to such an extreme people are making meme compilations about this AI agent.
tldr some random guy named Bowie Knife99 is such a crazy player unironically their AI agent is ruining the Forza Horizon 6 experience. It's plays like an angry younger brother.
