Could we please consider lowering down, muffling, or entirely disabling the sounds being produces across servers whenever a dragon is killed? I play mostly at night and it is when the sound is especially disturbing. I reckon the textual confirmation, as probably it is purely for bragging reasons anyway, would be more than enough.
We might be able to do something similar to the wither fix, but I don't think it's worth the efford. Just turn down your sound volume.
Load the update from the MyM Launcher and make sure the Music Collection is enabled, it will remove the ender dragon death sound on your client.