A lawyer for Josef E. Fischer, a Boston doctor accused of sex discrimination, criticized a Massachusetts Supreme Judicial Court ruling that will allow a lawsuit filed against his client to go to trial rather than be resolved through arbitration. The suit, filed by Carol Warfield, former head of anesthesiology at Beth Israel Deaconess Medical Center, accused Fischer of abusive and demeaning treatment. A few months after it was filed, Fischer was asked to resign as chief of surgery because of what the Boston hospital termed an inappropriate management style.