The prospect of Susan Sarandon playing Hollywood legend Bette Davis in the new FX series,“Feud: Bette and Joan,” is already generating white-hot excitement among gay audiences. And it’s easy to see why: Sarandon, 70, is a longtime advocate for LGBTQ rights, while Davis, who died in 1989, has been an enduring gay icon. Speaking to PrideSource in advance of the show’s March 5 debut, Sarandon was more coy about her own love life.