Is the average teenage population really have a lack of respect?

Appointment booked for 7.30pm last night. Quick c++ basics lesson and homework help as a favour for my wife's classmate's kid. I never used c++ by trade so I spent some time getting familiar with it, and how to play Farkle.

7.30pm comes and the 17yo just bails and says they're having dinner, no apology. Wife and I were like, fuck it, dumped the appointment and went to sleep at 8pm.

Sent another message this morning reminding them to be there or cancel 4hr before, some notes and a reminder that they don't have enough time now, and don't chicken out. Straight up says they promise, no greetings.