A friend of mine is late ALL the time. It's pathetic. I can accept occasional lateness with a phone call apology in advance/right around the time of expected arrival. But when people start having to tell you to arrived 1-2 hours early so that you'll be close to on time, it's just sad. Once she was *3* hours late and after half an hour, we called her and she giggled and said she'd arrive 'eventually.' By the time we got to the benefit event where we were expected, there was no food left. We would have left without her but someone stupidly let her hold the tickets!
Bad customer service. I work in customer service and it's the worst when I see it in people I work with. I've been (very rarely) guilty of it under extreme duress, but there's no excuse for not greeting a customer, wishing him well, and making sure he found what he was looking for--even when you're earning minimum wage, as we do at my Blockbuster.
Parents of adult children who still baby them. A friend of mine cannot get up in the morning unless her mom wakes her up. Buy an alarm clock already--you're 25! Another friend, same age and getting married in a few months, doesn't pay ANY of her own bills, even though she has a job. And all she has to do is whine and her parents buy her whatever she wants.
Similarly, parents who although they dont' "baby" their adult children, don't recognize the adult.
Kids/teens with entitlement issues. At my job, I have so many teens who arrive and don't have their card or ID and want to rent, or try to rent when they are not added as potential renters on the account. It's a legal issue that we cannot rent without one or the other, and I've had kids say, "My mom's going to call you and complain!" or tell me that it's okay for me to let THEM do it.