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

"When visiting Santorini, it's important to respect the local customs and traditions to avoid any cultural faux pas. For instance, Greeks are known for their hospitality, so refusing an offer of food or drink can be seen as rude. Dress modestly, especially when visiting religious sites like churches or monasteries. Women should cover their shoulders and knees, while men should avoid wearing shorts. Avoid discussing sensitive topics such as politics, the economic crisis, or the dispute with North Macedonia over the name issue. Greeks are very passionate about their country and these topics can lead to heated debates. Do not take photos of people without their permission, especially the elderly. This is considered disrespectful. Avoid making the 'moutza' gesture, which is extending all fingers and presenting the palm towards someone. This is considered a serious insult in Greece. Do not litter or vandalize, especially at historical sites. Greeks are proud of their history and culture and damaging it is seen as highly disrespectful. Lastly, do not rush or push in lines. Greeks value patience and respect for others, so wait your turn and respect personal space," mentioned another expat when asked about moving to Santorini, Greece.