He's forgotten that it's his fans who provide all the luxuries he gets to enjoy.
I feel sorry for the poor kids who had to leave. Most of his fans are young, so him being that late is totally out of order. Plus, they'll be feeling heartbroken to realise their idol has no respect for them.
Today there are a few less Beliebers than there were this time yesterday.
Some other acts have been notoriously late in the past - Guns n Roses and Public Image spring to mind. But their fanbases were very different (and older) - if you go to see those acts a bit of outrageous liberty taking is part of the deal.
Whether he likes it or not, Bieber is a kiddies entertainer.