The real reason everyone hates tourists

But it doesn't have to happen to you. Here's some expert advice.

When I lived in Athens a few years ago, I stumbled across a wall freshly spray-painted with the words: "TOURISTS GO HOME!" I was so stunned by it that I had to take a picture.

Today, I probably wouldn't even notice it. Not after the recent anti-tourism protests in Barcelona and after Venice imposed a $ 5-a-day fee for day visitors.

Be a better traveler in…