Earlier quoted context omitted.
It's not a private conversation. I can't even ignore the conversation of annoying people three seats down in the train. When people in the seat behind me will start talking during a conference there would be no way for me not to listen to their conversation.
Just because you have good hearing and/or are incapable of focusing on something else does not make the conversation less private. A private conversation is one that is intended to occur only between the parties involved. Your being able to hear it or not is irrelevant if the intention and expectation was that the conversation is meant to be between specific parties. I understand this is not completely black and whit…
Furthermore they continued their discussion while the presenter was talking. That right there is going to annoy people around them, even if they had the most innocent conversation in the world. Which they weren't. In fact her description left me with the impression that she thought they were specifically joking about her.
Basic scenario. Off color jokes starting off of your conversation, that you feel are directed at you, by random strangers in a public space. I can understand her getting upset by that. She may have been mistaken in her impressions, but her unfortunate emotional reaction is understandable to me.