While I know you're just stating your opinion, I don't think it's fair for you to assume that the person did not know what they were doing. It could be that their computer station froze up. How many times have you tried to book online and your computer froze or timed out? Is that your fault? No, it's the booking engine or the server or an overload on the system with too many users trying to access info at the same time.
I understand the frustration, believe me, I think there are huge improvements that can be made to the booking system. But really, is it that much of an inconvenience in the whole scheme of things? Maybe I'm blowing this out of proportion, but it seems like people (sorry, not directing this at you, just the general population) are so quick to complain about these temporary glitches when they call so often, it probably only occurs maybe once out of the 50 or so times they call regarding their reservation. If it is happening more often than that, then I would seriously advise that person to refrain from playing the lottery or going to Vegas, cause it seems as thought they just have bad luck.