The end of the world is right around the corner yet there they were taking time out to attend the same "worldly" music event with you and all of the rest of the non JW audience. They were outnumbered and their JW reasonings for shunning you must have seemed pretty feeble at that moment. I'm guessing that's what the red faces were all about.
Call it vanity if you will but there's something very satisfying about having your former JW friends and family see you doing well and carrying on with your life normally rather than it having become the "train wreck" they had expected or even may have hope for, on some level.