If you are making a joke do it like this
1)
Sith: Hello People, I am a new user
Rayso: (No Offence)>> Get Lost!
or
2)
Sith: Hello People, I am a new user
Rayso: [joke]GTFO[/joke]
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By doing like this you can show the other person that you are joking.
But If you directly post "GTFO" or words like that this rule will work on you.
Got it?
Post here if you are still confused