As the BFI celebrates 20 years since the release of Spike Lee's seminal film with The Independent Interview and a season of movies on the Southbank, the director talks to Kaleem Aftab about race and retrospectives

Spike Lee arrives at the BFI Southbank on Monday as part of a celebration of Do The Right Thing, his third film, which premiered at the Cannes film festival in 1989. In the two decades since then, the film has been recognised by the American Film Institute as one of the greatest 100 American movies in film history and was highly listed in a Sight and Sound Poll of the best films of the past 25 years. It was also, as Barack Obama coyly admitted last year, the movie that the President of the United States of America took Michelle to see on their first date. All in all, a far cry from the divisions and debate that the race drama provoked on its release.

It was the most controversial and discussed film of that summer. You couldn't pick up a magazine or newspaper without someone having an opinion on the Brooklyn tale or the director. Critics David Denby in New York Magazine and Richard Corliss in Time argued that Do The Right Thing was of no value except as agitprop to incite the black community to riot. In the opposite corner was Roger Ebert who wrote that "it comes closer to reflecting the current state of race relations in America than any other movie of our time".

It's not to belittle Lee's other films, including Malcolm X or Inside Man, or his two great documentaries 4 Little Girls about the 1963 church bombing in Birmingham, Alabama and the Katrina documentary When the Levees Broke, to state that Do The Right Thing remains the key work in his oeuvre. The director would never admit that it's his best film. "My films are like my children", he says. "I don't have a favourite." Yet in all the literature that Lee approves, from the children's book he wrote with his lawyer-turned-writer wife Tonya, Please, Baby, Please to the blurbs on the back of DVDs, it's always Do The Right Thing that is given the status of first among equals.