OT: You don't JUST play videogames on the weekend, right? You have something else going on in your life, some other form of social activity?
If not, and there are likely people on here reading this, then those idiot girls are at least a little right. I LOVE videogames. When my wife left for a work retreat one weekend, I told my friends I was going along, ordered 3 pizzas and played videogames for two days straight. BUT, you have to have a life outside of video games.
There's a reason people who play games are looked down upon, and that's because it can become all-consuming. Games are so fun, that you really don't need to do anything else and you'll have a good time. But some people realize this, and decide that everything else isn't worth the effort and shut themselves inside their homes and lose connection with the rest of society.
These girls asked what you do on weekends. In your answer, you had an opportunity to define yourself outside of the forced-social environment. What you say you do, and what you do do, define you as an individual. If you said you help orphans learn to read, then that is what you are. If you said you write books, that is what you are. Maybe you snowboard occasionally, maybe you take photographs, maybe you cook. But you said videogames.
Videogames are fun, but they are also easy. Yes, there are difficult games, but it is far easier to throw in a different disc than it is to call someone and ask if they want to do something. Some gamers know this, and so they choose to stay isolated. Games become what they are. And in the end, though gaming is fun and sometimes challenging, all you are truly doing is pushing buttons. That is what you are.
I'm not recommending that the next time people ask this question, and they will, that you lie. But take 2 weekends, do something amazing that you've always wanted to do, and when someone asks say "Sometimes, I _______. Otherwise, I play videogames." And for good effect, add, "Or I hang out with friends doing nothing." Doing nothing with friends is always doing something. If you play games with friends (in person), then say you're hanging out with friends and drop the videogame line.
Everyone plays videogames. But the only people who are looked down upon for doing so are the ones who are defined by it. And even as a gamer, someone who has been a gamer for a long time, I look down on people who are defined only by playing videogames.