I also meet people at E3 and various other conferences. I go to these conferences and I enjoy myself, but I've noticed that very few people actually talk to me. It's almost as if there's a giant bubble around me or I'm completely invisible. Wherever I go, the crowd splits or I'm not seen at all, and someone comes running into me, knocking me over.
Y'know, sometimes, I just don't know what to think.
For the most part, you can't just simplify the type of guys you are running into. Some will be the mainstream/casual/jock gamer that only plays Madden, Halo and Counterstrike, who likely view it as a competitive men's league. Plenty of guys will play sports with girls casually, but if they want to compete, it's men only. Same goes for games with a lot of them, even though it's totally different.
Then you have the high school or middle school kids lacking maturity. Either they are reacting off of hormones or off of the attitude that 4chan made ever so cool (basically that if you're an asshole on the internet you're awesome). Even the boys with brains and good intentions may make mistakes here, as they just haven't learned yet.
However, things like what you ran into? I seriously don't know what to think. Then again, at my gaming club, I really don't know what to think either. I know a few gaming girls, and I have played with some of them. To answer the person that brought up the Halo scenario, I act the same against girls as I do against guys: I shout, yell, exclaim and have fun. I do not trash talk, but more utter out "FUCK!" and "COCK MONKEYS!" as if I'm a man with tourettes. In the end, though, most of the girls that join the club in the beginning of the year end up not coming to the meetings shortly after, and I see it as a fault of some of the other members as well as the current E-Board: in the end, if you have a brain, you don't want to be part of the club because it doesn't foster any real intellectual thought.
Me, personally, I see nothing wrong with a girl playing. I rarely play on Xbox Live myself anyway, but the only shock I've really reacted with was when I was playing Shadowrun and a girl's voice spoke from the mouth of the other Troll on the team. Don't quite expect that.

I'm also an advocate of allowing both mail and female models for characters being available, and was quite disappointed when Shadowrun, a multiplayer only title, lacked female models.
I will admit, though, that the few times I hear a girl gaming online or see a girl in public wearing gamer apparel I would actually like to talk with her. I admit part of it is hormones, but most of it is simply that I've spent so much of my life hanging with other guys and speaking with guys that, in the few times I get to speak with a girl about things, it's a little different. While gender makes a minor difference, the difference is there. So, I wouldn't mind finding out if these gamer girls have a brain or not, what their interests are, etc. Unfortunately, the gamer girls that have depth don't like being treated special simply because they are girls, while the ones without depth soak up all the attention and crave more (funny note: I could've ended up dating the latter type last year if I didn't think "screw my friends telling me to go for it, I need to learn more about her first". Man, I made the right choice, because I can't stand talking to her now...).
I think that whole attention thing ends up making things worse, though. Girls with intelligence and depth hide away, making their presence less. At the same time, when a guy discovers they exist, they give attention to them because such a thing to find is rare. I mean, look at this thread. There are several girls here that have commented only once or twice throughout the entire forum just for this article, yet there are plenty of guys I've seen in other threads posting more commonly. I'm intrigued that each of these girls is posting with their brain, as the gaming girl I come into contact most is annoying and honestly a complete ditz. If the smart girls spoke out more, wouldn't it become more normal after a while? Sure, you'll get lots of attention at first, but over time won't it change?
Which actually goes to the conclusion of the article. Remember how the Guild leader asked Whitney/Teleios to speak more? The result being more girls joining, which will inevitably result in less crap to deal with? Granted there are still adjustments to be made, but honestly, if girl gamers start talking more and tell the assholes to stick it where the sun doesn't shine, then gamer girls will gradually be more accepted.
Anyway, apologies if this doesn't make much sense or seems rambly. I actually rewrote it all, and I'm getting tired, so I may have just written poorly in the end. Also, is it just me, or is there a lot of revival of the "girls in gaming" articles here? Not saying that to knock it, as I'm glad to be discussing it at all for a change, but it's more than I expected.