The special, which premiered on HBO Max on May 27, was accused of ignoring the show's long-criticized diversity problem.
But in an interview with the Times published on Sunday, Winston said he believes those criticizing the special for a lack of diversity haven't actually seen it.
"We have Malala, Mindy Kaling, BTS," Winston said. "There are three women from Ghana, one who talks about how Friends saved her life. Two boys from Kenya. Three kids in India."
"What more diversity do they want in this reunion?" he went on. "The cast is the cast. It was made in 1994. I think it's remarkable how well it does stand the test of time."