Without criticizing a specific nation, please mention things that tourists do to annoy people of your country/region, but also explain the cultural difference.
For example, if you live in Paris, you might say, "Many tourists expect Parisian restaurant / cafe wait staff to check on them frequently. They may even wave their arms and call for the waiter. In Parisian culture, this is very rude. Our culture views proper etiquette in restaurants / cafes as [this way].