Responding to people talking in public when you overhear a conversation can be seen as either rude or normal, depending on the context and the manner in which you respond. Here are some considerations:
Unsolicited Interjections: If you interrupt a conversation without being invited or welcomed into it, it's generally considered rude. People may view it as intrusive and disrespectful of their privacy.
Volume and Disturbance: If you respond loudly and create a disturbance, it's more likely to be seen as rude. Being mindful of the volume and the public setting is essential.
Subject Matter: If the topic being discussed is sensitive or private, interjecting could be considered inappropriate and offensive.
Positive Contribution: If you have something genuinely relevant or helpful to add to the conversation, and you do so respectfully, some people might not mind. For example, if someone is seeking directions, and you can provide them politely, it may be appreciated.
Cultural Norms: Different cultures have varying norms about engaging with strangers in public. In some cultures, it may be more acceptable to engage in casual conversation, while in others, it may be frowned upon.
Body Language: Pay attention to the body language of the people in the conversation. If they seem open and friendly, they might be more receptive to a response.
In general, it's best to exercise caution when responding to overheard conversations. If you're uncertain about whether to engage, it's usually better to err on the side of caution and refrain from intervening unless there's a clear reason to do so. If you feel compelled to join the conversation, try to be polite and respectful, and gauge the reactions of those involved to ensure you're not imposing on their space.