I think this is a bit of an overreaction, but Cam was pretty dumb to say it. It IS a sport played by dudes, and that's the perspective he's coming from. At the same time, it was completely disrespectful - there are obviously a ton of women who cover football and understand the game, and they're just doing their jobs.
Cam has had his media issues previously, and I think he tends to view these mandatory pressers in a Belicheckian kind of way - with disdain. He let that become a sexist thing, so deserves the criticism, but people should chill a little. It was just a dumb remark.