Not knowing who Yotsuba is
Asking where to find her
You handle quite well. Not only do you ask innocently, you also "forget" to use references in your posts. You act like a real newfag. There are two issues, though.
1)You came on too strong just by asking who yotsuba is. Do someone else that /a/ obsesses about, maybe kaiji
2)You've been banned, so that means you have at least some experience.
Overall, you used the right techniques, but not the right medium to execute them. Your score would have been higher had you simply used someone else.