Boundary

You set a healthy boundary with a clear consequence for breaking that boundary - “If you fight, then I will leave.”
And your family violated that boundary. It’s always hysterical to see how the perpetrators and enablers of boundary violations always act like they’re the real victim or shame the people who enforce healthy boundaries.
Your dad calling you “cowards” for being strong enough to protect your sanity is telling.
Edit: to anyone struggling with setting boundaries, if… then… statements can help - “if this, then that” aka ITTT.
Many people will just say: “please stop gossiping about aunt Mary.” Or “that’s hurting me, don’t do it.” Add ITTT to these statements.
“If you don’t stop gossiping, then I will leave this party.”
“If you say something racist or sexist, then I will ask you to leave my house.”
“If you park on my lawn, then I will have it towed.”
“If you keep drunk texting Henry Cavill’s Instagram for a threesome, then you better let me know when he accepts.”What is 30 too old for? : AskReddit?...........