The industry treats women like morons who don't know what they're doing. As such my evidence for these claims is this video.
It doesn't help that this is Gamestop doing this either. The fact that this was even filmed is pretty ridiculous in and of itself.
You're absolutely right here, conventional "nerd" hobbies are being more and more introduced to the female half today than they were back in say the 80's or 90's. This sexism stems from the fact that like most industries, game development is a heavily male dominated industry, and as such they follow what men like.
You can give people crap who buy party games for their Wii or who still play Pokemon (which is also getting very risque. Have you seen how short the female trainer's shorts are in Black and White? They go all the way to the summit of Mount Everest ffs.) but the people who very nice lady the most about how the industry has changed are the so-called hardcore demographic. I really wish I knew where it was but I saw an article about how it's time for the gaming industry to grow up and I agreed to within the last millimeter of space on the webpage.
Nerd fandom isn't strictly a boys club anymore, and we have to remember that while yes there are some reasonably attractive girls go to these cons, treating them as eye candy isn't really the best way to see them be creative or enjoy themselves in your company, and that's what we really want to see.
Also in regards to the sandwich comments, why wouldn't people ask me to do it? I'd make some of the best damn sandwiches they've ever had. Stupid ding-dongs.