Christy Martin -- I'm Never Fighting in California Again!

Christy Martin vows she will never fight in California again, because the California State Athletic Commission just refused to overturn what she called a sexist decision in her last fight.

The commission met moments ago in L.A. and heard testimony about the referee's decision to stop Christy's June fight against Dakota Stone, after the fight doctor determined Christy's hand was too injured to keep fighting. Christy's lawyer, Gloria Allred, had argued the ref would never have stopped the fight if men were in the ring.

The commission refused to overturn the decision -- so Christy now swears ... she will NEVER fight in California ever again.