Rude behaviour of vendors

Hi Dudes!well today.i went to a shop vendor(i am declining to say who)wanting to change a 2 dollar note for coins.But i was rudely rejected like'NO change!Only buy.'so i did what many people would have done--bought the cheapest thing i could find which was.......A suan mei candy which costs 20 cents each.when i bought it,the man was disgusted and (i think he wanted to spite me)and grabbed a whole bunch of 10 cents coins and pratically threw it in front of me.Then,he slowly counted.....



What i am trying to say here is that if you are doing a business.shouldnt u treat your costomers better.especially during this tough times!the food that particular vandor store wasnt excellent either.......Well i am definately not eating there anymore.although that is just one customer,slowly the number will build up!