re: You notice the person who just bought your lunch didn't tip enough

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3 dollar tip on an 80 dollar bill. She wasn't doing it to be rude or anything, just doesn't know any better

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I have a hard time believing this

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It's not that far fetched.
For example, I have been tipping 15-20% (up to 25% on smaller tabs) for the past few years regardless of service; and I thought that was great.
Well I read a thread here recently where apparently 20% is the new norm, I definitely wasn't aware of that etiquette and I have since adjusted.
Like he said some people just don't know.