Dammit LoneKiller, you're not the only person on this forum that likes making threads you know. (Stop using up the damn server space!)
No in all seriousness, the guy was probably having a really ****** day and saw you filling your cart, figured you were some fat ******* who planned on cleaning out a cheap section of "junkish food" from the store to live on for the next century, and I guess that image he painted for himself (however wrong it might be) instantly clicked in his head, and due to his cranky nature, decided to make a wisecrack.
Either that, or everyone on this planet are all depressed with society and have just given up, hating everyone and everything in it.
He'll be dead from Suicide-by-Cop by next week.
Once I was in a store and saw some old prick arguing with a fairly young new manager, about wanting some particular salmon they had been selling cheap the previous day. He whined, went on about not having a lot of money and such, bitching and complaining as he goes, the typical I'M THE CUSTOMER AND THAT MEANS I'M ALWAYS RIGHT behaviour most people have when things come down to handing money over...anyway, started moaning about the fish being gone as if it was her fault...so in order to get rid of him, she allowed him to have a nicer, more expensive version of the fish (probably from their finest range, instead of the value range) for the price of the discounted fish he previously wanted. His response wasn't thought out, probably because he really just wanted to fight more and prove himself right - "I don't want that fish for (threepoundsomething) I wanted that fish for (threepoundsomething) at which point I exploded and died inside.
I guess some people are just born to cause ****.