Since everyone in the family (according to Will) apparently agrees with Darius' evaluation of JJ's behavior being in line with his persona as a tattle-tale drama queen, this will probably make him feel no one has his back, in spite of the fact everyone also thought Stef's behavior was wrong. If JJ had sent the email to Brad and JP only, the news would still have gotten out to the rest of them due to Brad's decision about the condo. JJ would have gotten sympathy and support from everyone in that case.
So the sad thing is JJ can't see how his actions sabotage the sympathy he is trying to get. Yet, the other goal he wants to achieve is immediately acted on - to have a home of his own where he makes the decisions, a wish which all of us think is quite reasonable. And since Brad, Will and Darius were obviously intending to make that happen asap, I find it hard to understand how some readers say they're not supportive of their son/brother. But I will admit that Will's suggestion of a possible way to end the party wasn't really useful, since it's something he could have done, but not JJ. I think JJ's method was fine - and a cool revenge on Stef.