how can i disable Discord Core Server Chat Message

Can you be more specific on which message you want disabled?

When I write an in-game chat message, it also appears in my Discord chat. Where I have the Discord Core Bot

Discord Core doesn't do anything with chat messages. It only processes commands users type on the server. Are you sure you don't have another plugin that processes server chat like DiscordChat or Rustcord?

omg i missed Rustcord 🤦