PLEASE don't be afraid to show authority and command the crowd. Do it with a sincere smile and you'll be amazed at your scores.
If you enforce it and do it in a good way like described in the above post your scores will more than likely go up - not down. Might even get a few chuckles out of the crowd if you do it in a pleasant way if you can put a little levity in the moment.
Example: Had a guy ask if Delta carried Kahlua and the flight attendant exclaimed with a witty "Have you been cheating on me? Thats not this airline!" Whole cabin bust out laughing for a good 30 seconds including him. This could have gone a different way "Wrong airline sir..." Same message, different delivery and the later might have embarrassed the customer and even pissed them off to complain.
And it takes time to break this habit.