Well, hate to bring up a semi-old topic, but I think this could be of use. Today, I packed up a deck of cards, the raven, and a few other tricks as I headed to the mall with a friend. I very politely asked about 30 people throughout the entire day if they would like to see a quick magic/card trick...and wow. There was an old lady who stuck up her hand, said "PFFFT!" and walked faster, some lady just started straight up laughing at me, and other very rude responses. Apparently this is against the rules, but I am 13. I've been doing magic for about 3 years now. I've practiced my tricks in and out..and I KNOW for a fact if I was older I wouldn't have gotten that rude of responses. So take my advice, and don't attempt street magic until your older.
I hope you get permission from the mall first. You even seem to have admitted that it was against the rules, age is not a matter when it comes to these types of rules. They are set there for several reasons, one being a lawsuit.
Drew was smart enough to check with the manager first. Sounds like you did not. And what Drew did was not exactly street, the people were generally in a sitting state (or at least thats what I expect to see in a coffee shop), they are there taking their time generally to sit and relax. People in the mall are generally there to get stuff done and some are rather bussy.
And theres no way you "know for a fact" that you wouldnt have gotten those rude responses. You cant know, as your not there yet. Your just assuming. They might actually think that you were being rude.