I have zero tolerance for individuals who say they are going to do something or be somewhere and they flake or are extremely late. I don't have a problem with someone changing plans on me, that's life. I DO have a problem when friends casually dismiss plans. It shows a blatant lack of disrespect not only for the other person but also for the time at hand.
Please don't waste my time. Please show respect for others and their use of time. And if need be, cancel plans instead of being passive aggressive. Oh and lastly, please be aware of how lame you are. Thank you and good evening.