The situation would upset me.
The therapy relationship is very deep and intimate, and sadly this does not mesh with the "real world" in a lot of ways. In the real world, culturally you are supposed to be casual and uncaring with most people in public, and not not feel too much for professionals. I'd say it was an unwritten social rule.
So when someone makes something lighthearted of a deep experience, it feels like I come crashing back down to Earth, and that I have made a terrible social blunder that everyone can see. Theres a lot of feelings of shame there.
So I relate to your feelings, but I would also say don't worry too much as I doubt anyone else in the room made anything of it!