Disabling a server's resource pack in Minecraft is easy to do. First, you need to open the server settings menu. This can be accessed by clicking the "Settings" button in the server list. Once you are in the server settings, you should see a section labeled "Resource Packs." In this section, you can disable or enable resource packs. You can also choose which resource packs to use. To disable a resource pack, simply uncheck the box next to it. Once you have done this, the resource pack will no longer be used on the server.