The Gay & Lesbian Alliance Against Defamation is urging ABC to air an episode of “Roseanne” that shows the lead character exchanging a kiss with another woman in a gay bar.ABC has had no comment on statements attributed to Tom Arnold, one of the show’s exec producers, maintaining that the network refused to air the episode, which was scheduled for March 1, according to Arnold. “It should air as scheduled,” GLAAD exec director Lee Werbel told the Associated Press, lauding “Roseanne” for its “honest portrayals” of gay and lesbian issues. In the disputed scene, Roseanne Conner goes to a bar with a bisexual friend, played by Sandra Bernhard, and ends up dancing with — and being kissed by — a character played by Mariel Hemingway. During its six seasons, “Roseanne” has dealt with controversial subject matters including drug use, abusive relationships and homosexuality. Carsey-Werner Co., which produces the show, is currently in negotiations with ABC regarding an extension of the program.