Why do guys think all girls gossip and be all frilly and girly?

My friend thinks that we paint our nails 24/7 that we talk about boys like "OMG (W.E) IS SOO CUTE" "IKR BUT I LIKE (W.E)" and that we play with barbies talk about shakespear and watchy sappy chick flicks. When in reality, most of us don't. Me and my friends draw wolves and dragons, play on the computer, play xbox and ps3, we say "dude I'm so hungry I need food but I'm too lazy to get back up" we sleep until 2-6 in the afternoon after staying up till 4 in the morning and we pretend we're dragons and wild animals that murder eachother. We also and we watch ghost adventures and paranormal challenge. Why do ALL guys. Think we do these stupid things?