MOST folks mellow with age, but 81-year-old Burt Reynolds still hates acid-tongued comic Joan Rivers — even though she’s been dead for nearly four years!

“Burt never forgave Joan for kicking him when he was down,” says a source. “He thought she was a mean woman who made a living by spreading rumors about him — just because he’d criticized her comedy.”

Joan, who died after a botched 2014 medical procedure, attacked Burt while his career and health were in the dumpster, publicly mocking him about his looks and thinning hair.

Learn about how these two hollywood legends feuded with each other throughout their years in tinseltown!