This is a great question. In my opinion, we have come a very long way when it comes to class in film. This is a very different thing than saying that we have come a long way in reality. In reality, people are constantly judged based on class. However, in make believe, that is, films, I do not see too much discrimination when it comes to class. Part of the reason for this is class is harder to depict and much easier to conceal. How do you conceal race or gender?
For example, people from all different backgrounds are in films and people from all different races are in film as well. From this perspective, class almost does not even exist as a factor.
In film what is much more prevelant is race and gender. Race and gender still plays a huge role in films. For example, there are more leading men in action movies and few women. Asian are given a certain role and often type cast. Class distinctions are far more subtle.