Bat attitude

Since when is it a crime to laugh inside a resturant with your friends? My wife and I with 2 of our friends went to McDonald's in klerksdorp on 13th of July. We got very good service from the cashier. Aftet about a hour sitting there, we had a good laugh and enjoyed our time there. The manager i presume, {Thamisa/Thami} came to our table and asked us to be quiet... To lower our selves... Never in my life have i been asked lower my laugh in any resturant. And the attitude towards us was not warming at all. I would've understood if there was other people in the place. But there was no one. But us.