From the movie Do the Right Thing by Spike Lee, what​ ​is​ ​the​ ​role​ ​films​ ​play​ ​in​ ​perpetuating​ ​stereotypes​ ​in​ ​contemporary​ ​society?

In considering this question, we need to distinguish between "perpetuating" a stereotype in the sense, on the one hand, of causing or encouraging people to continue believing in it, and on the other hand, of showing a stereotype in order to debunk it, to reveal how false and pernicious it is.
Spike Lee's detractors might assert that he at least inadvertently does the former, in Do the Right Thing and perhaps other films. Much of the behavior of some of his characters, both white and black, seems to conform to negative patterns that people through the centuries have continued to believe in as widespread and typical of all or most members of a group. But whether or not these behaviors are in fact real or negative is usually a matter of perception. A filmgoer who comes into the cinema with preconceived ideas or long-standing prejudices is likely to view the action of a film such as Do the Right Thing quite differently from someone who has a greater understanding of the factors that have led to the stereotyping that has been so tragically common in our society.
Lee realistically presents racial conflicts as they unfortunately have been and continue to be. In Do the Right Thing, Sal's Pizzeria is a microcosm of the dysfunctional dynamic of US society, in which people allow themselves to magnify the differences they see in others, rather than accepting them and trying to perceive others in a positive light. Lee does not "perpetuate" stereotypes, but rather, he examines them. Like any artist who is frank and open with his subject matter, Lee throughout his career has run the risk of being criticized by those who confuse honesty with negativity.