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

"In Mykonos, it is considered disrespectful to refuse food or drink when offered by a host, as hospitality is a significant part of Greek culture. Dress modestly, especially when visiting religious sites, as Greeks are predominantly Orthodox Christians and showing too much skin can be seen as disrespectful. Avoid discussing politics and the country's economic situation, as these are sensitive topics. Do not take photos of people without their permission, especially the elderly and monks. It's also considered rude to wave with an open hand, as Greeks use this gesture to express dismissal or disrespect. Lastly, avoid littering or disrespecting the environment, as Greeks take pride in their beautiful islands," remarked another expat in Mykonos, Greece.