Fall off bike. Get up. Get back on bike. Ride again. It happens everyone, better to find out how than after you learned 20 songs.
You mention you didn't know any of the music they were into other than Green Day. To he fair, I would be reluctant to bring someone into a band who wasn't into the music I was playing, so I'd say this is probably why you're not in, more than anything else. You want the right player, not just someone who can play, and having the same tastes is about 90% of the battle, for me. They weren't the right band for you and they didn't mess you around. That's pretty good going, I would say 🙂
Find the right band for you, put that energy into it and you'll be grand.