Sally Field’s youngest son, Sam Greisman, thinks his time on the set of “Steel Magnolias” made him gay. The actress, 79, recalled her experience filming the 1989 movie with People , calling it a “wonderful, wonderful experience.” “We loved each other, all of us, we just completely adored each other,” she said about the cast of iconic women, which also included Julia Roberts, Shirley MacLaine, Dolly Parton, Daryl Hannah and Olympia Dukakis. Sally Field’s youngest son, Sam, (both seen here in 2024) joked that “Steel Magnolias” is the reason he’s gay. WireImage for Vanity Fair Field starred in the 1989 film with Shirley MacLaine, Olympia Dukakis, Julia Roberts, Daryl Hannah and Dolly Parton (as seen here). ©TriStar Pictures/Courtesy Everett Collection “We would go shopping on the weekends — all together!…