Words of the wise: "Don't piss off someone who is able to beat the shit out of you."
While not entirely accurate to this exact situation since it was just female 'bonding' and not a beat down the sentiment is there, the saying can be modified a bit to suit different scenarios.
"Don't piss off someone who is capable of dominating you."
"Don't piss off someone who is liable to kill you afterwards."
Anyone else have some good sayings?