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Everyone has to take their turn with being the butt of the joke.
The group always needs someone to roast, and as long as they roast everyone equally then peace will remain.
New Line Cinema
You know each other so well you know exactly what buttons you can push, and what ones you should probably leave alone.
NBC
But if someone from outside your group says something about someone, that's a whole different matter.
If they don't know the back story, then they can't use the hilariously mean nickname.
Regency Enterprices
Even if you're apart it's import to keep up to date on absolutely everything that's happening in each other's lives.
And you probably do this over several complicated message groups.
Paramount Pictures