It is hard for our drinking buddy friends when we quit and they haven't. It makes them think about their own drinking, and they don't know quite how to act around us at the beginning. If the person is really a friend, he probably didn't mean to be insensitive. Stay away for awhile to let everyone get used to the new changes-he may surprise you down the road.
My friends were the type that were supportive on one hand, and on the other were asking me how long I planned to do this. They are now back to treating me normally, but it took a few months for all of us to adjust.
Congrats on your 12 days-you're off to a great start and you have a good commitment to sticking to it!