Why does Sean Penn portray Harvey Milk as an effeminate flamer?

All file footage shows Harvey Milk is masculine and doesn't squish when giving speeches, yet Sean Penn portrays him as a flamer. Why is this? And why isn't Penn being criticized for it? A more general question is, why does the Left perpetuate the gay stereotypes more than the Right and get away with it? In fact, it's the right who says that gays are masculine and can't be "detected." It's the Left who keeps showcasing these queens on TV and films.