Do you realize how ignorant and ridiculous this comment is? Nobody who plays Angry Birds thinks it's a complex, deep, rich immersive game with a compelling narrative about the friggin human condition, dude. It's a mobile game, people play it on their phones while sitting in a waiting room. It's supposed to be simple. Do you think Portal 2 is a complicated game? It's not; also fairly simple. Whether you think Angry Birds stupid or not is just a matter of your personal taste, not an indication of the mental capacity of people playing it. (The fact that you'd interpret it as such says more about your own mental capacity than theirs, frankly.)
Or, maybe they are just normal, intelligent people stuck in line at the bank who can pull out their phone, kill 10 minutes playing a simple but fun game, and then go on with their day? I play that "kind" of game just like I play many other kinds of games. Guess what? I can't bring my desktop PC into the waiting room and don't have time to fire up a full game of Starcraft 2 or EU3 or Crysis 2 even if I could. I've got 5-10 minutes and my phone is in my pocket, so yes, I'm going to pick up my game of Angry Birds and finish the puzzle that I left off last time.
You guys really ought to grow up and move into the 21st century sometime. Gaming isn't just for your proverbial basement-dwelling Warcraft nerd anymore, and that's a good thing for everyone, even dedicated gamers.