I'm not surprised that it was Anna that talked about it, though. From my experience, children under ten (usually) are still new enough at social interaction that they not only accept it but seem to understand it intuitively. (Usually. I'm by no means saying it's universal, just common in my experience.)

Once people get older than that, self-consciousness and guilt by association become understood concepts, and it's difficult to break through those barriers until someone has experienced enough of the world to learn that nothing is simple or normal.

You reached out and tried to share with someone. We all need that. You'll find it eventually (offline), and experiences like this will help you learn when and how to go about it.

Until then, I agree with trying to help Anna understand that some things need to be handled more carefully.