The few, the proud...the less?

Why do people continue to use the words "few" and "less" incorrectly? I'm tired of hearing and seeing advertisements that say, "this has less carbs". It's FEWER carbs, punk! You can have less money, or less water, but you'd say you have less water because you have fewer bottles. If people speak incorrectly that's fine...I hate when people correct grammar in everyday conversation, but in an edited commercial, or written on a label?! Do some proofreading for God's sake.