Tipping...

Okay mister commissary bagger was my 4 dollar tip not enough??? I usually go by the .25 a bag rule when I tip the baggers at the commissary (military grocery store). Today I tipped the guy 4 dollars and he just got this disgusted look on his face and walked away! Seriously??? I thought it was a really good tip. I try to tip good knowing that they only work for tips, but geez could you be a little gracious!! It just really annoyed me that he was so rude. Have people become so greedy that they expect a good tip no matter what??? If I get this guy again I may just give him a dollar and let him be on his merry way.