Not to invalidate the way you feel about that interaction, but putting myself in their shoes- I’m not sure my response would be much better.

Running a booth at a conference is EXHAUSTING. Also, that was your first interaction with them and you were at peak excitement. That might’ve been the thousandth time they had heard similar and their spark may have faded by the time you got there.

I get it though, we feel the way we feel. It sucks when your enthusiasm goes un-matched. I’ve written off companies for interactions a more objective bystander might charitably forgive.

BTW- I’ve got no relation to the company or product. I’m just a happy customer who’s run a booth or two in my day and also felt the same way as you about other companies too.