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Teetotaller
Cultural Sensitivity
Understand that being a teetotaller can be due to personal, religious, or health reasons. It's a lifestyle choice that should be respected. 
Choice Not Judgment
Teetotaller simply describes a choice not to drink alcohol; it shouldn't imply a judgment about others' drinking habits. 
Conversation Context
The term 'teetotaller' might come up in conversations about lifestyle, health, or when planning social events and meals. 