Robert Patrick, a wildly prolific playwright who rendered gay (and straight) life with caustic wit, an open heart and fizzy camp, and whose 1964 play, “The Haunted Host,” became a touchstone of early gay theater, died on April 23 at his home in Los Angeles. One day in 1961, a 24-year-old Mr. Patrick followed a cute boy with long hair into the place, where the playwrights John Guare, Sam Shepard, Lanford Wilson and, soon, Mr. Patrick, all got their starts. The cute boy was John P. Dodd, who went on to be a well-known lighting designer and die of AIDS in 1991. No one was paid, except the cops, because Mr. Cino was not just running an unlicensed cabaret but also a gay hangout, which was illegal in the early 1960s. Its young playwrights, particularly Mr. Patrick, churned out plays, playlets and monologues akin to TikToks, as Don Shewey, the author and theater critic, said in a phone interview.

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