I am one of the founders. I do not consider it dwelling on the fact that we were rejected. It doesnt actually bother me at all as you can see from most of my previous posts I have been labeling ourselves that way to help motivate others to keep pushing forward. The second reason i label it this way is because i think on HackerNews people are naturally curious about all the Ycombinator applicants a little bit more than just any startup. I may be wrong though but this is my reasoning for highlighting the fact that we were indeed rejected but continue to move forward.
Bandsintown is an excellent web application and in my opinion the founders should be looking forward rather than dwelling on a past YC rejection.