Technology makes it all so easy. You just pull out your phone and bailing on a rendezvous is as easy as canceling an Uber driver.
There are different categories of bailing. There is canceling on friends. This seems to follow a bail curve pattern. People feel free to bail on close friends, because they will understand, and on distant friends, because they don’t matter so much, but they are less inclined to bail on medium-tier or fragile friends.
Then there is professional bailing. This tends to have a hierarchical structure. A high-status person will frequently bail on a lower-status colleague, but if an intern bails on a senior executive, it is a sign of serious disrespect.