there were no specific societal norms or rules regarding wearing one AirPod (or any earbud) in one ear and leaving the other ear open while talking to a stranger. However, it's essential to consider cultural and contextual factors when evaluating whether such behavior might be perceived as disrespectful.
In general, communication and social norms can vary between cultures and individuals. Some people may not find it disrespectful at all, while others might interpret it as a sign of not fully engaging in the conversation or showing less interest in what they have to say.
If you find yourself in a situation where you need to talk to a stranger and you're wearing earbuds, it's a good practice to be mindful of the context and the other person's comfort. If the situation allows, you could remove both earbuds before initiating the conversation to show that you are fully present and attentive. Alternatively, you could politely explain to the person that you are using the earbuds for a specific reason (e.g., listening to music, taking a call), but assure them that you are interested in what they have to say.
Overall, it's essential to be courteous and respectful when communicating with others, even if you have earbuds in your ears. Being mindful of the other person's feelings and maintaining good eye contact and active listening can go a long way in creating a positive and respectful interaction.