I have been gaming my whole life, I'm 24, and I can honestly say I've never seen this. My clan has a dozen female gamers of varying skill levels and they are treated exactly the same as male gamers. If they do great we celebrate with them and provide kudos. If they mess up we call them on it, joking insult, and provide feedback as how to improve. I see this issue as another sensationalized exaggeration of a diminishing problem.