I think it is a sign of where this country is going. There are so many people out there these days that have no respect for someone's time. People go back on their word all the time, last summer I hired several people that then never showed up for work. I have an apartment that I rent out, every time I have to find a new renter, I have several people set up an appointment and then never show. They do not call, they do not show up, they do not apologize for wasting my time.
I just had one last week that was supposed to meet me to look at the apartment at 6
m. At 6:05 he called me to say he was just leaving, had an errand to run and would most likely be here in an hour. I said no, I have plans to be at dinner in an hour. I was not lying, I did have plans. It this case it is not just my wasted time, since I have a renter in the apartment, I have to coordinate with him, it wastes his time too.
It appears to me that these people who go back on their word, or waste your time do not care at all that their actions are rude.