The topic is here:
For those who need to see it here:
Navigate to C:\Windows\System32\drivers\etc
Open the hosts file with Notepad
Add a new line at the very end, with the following:
Use Notepad++ to edit that file easily.
Note: It will only disable them for you, others need to do this to allow you to see their messages.
Note: This also disables the chat delay.
Credits: @CactusSteak2171 for showing me this