What cultural faux pas should I try to avoid making in Greece?

"Practically everyday. I "accidentally" offered to help a postal worker with a stapler and nearly had it thrown in my face. I "accidentally" laughed sarcastically when my daughter's teacher said they were going to have a "party" relating to the H1N1 virus," said a member in Athens, Greece.

CitizenM
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It's impossible to confuse citizenM with any other hotel. We don't look or sound like anyone else. Bold, vibrant, and artistic - that's us. Our rooms cater to modern travelers - enormous ultra-comfortable beds, unlimited free Wi-Fi and 24/7 food and drinks always waiting at canteenM. And best of all, our ambassadors are every guest's best friend.

CitizenM

It's impossible to confuse citizenM with any other hotel. We don't look or sound like anyone else. Bold, vibrant, and artistic - that's us. Our rooms cater to modern travelers - enormous ultra-comfortable beds, unlimited free Wi-Fi and 24/7 food and drinks always waiting at canteenM. And best of all, our ambassadors are every guest's best friend.
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"It is important to be mindful of cultural differences when visiting Greece. It is considered rude to show up late to social gatherings, so it is important to arrive on time. It is also important to dress modestly, especially when visiting religious sites. It is also important to be respectful of the local customs and traditions, and to avoid making negative comments about them. Additionally, it is important to be aware of the local laws and regulations, and to avoid engaging in any activities that are illegal in Greece. Finally, it is important to be respectful of the local people and their culture, and to avoid making any offensive or insensitive remarks," remarked another expat who made the move to Greece.