Respect is a two way deal - quite right. The officer only lost self-control because of the lack of respect shown to authority by multiple youths.
Oh god, the lack of logic is baffling
1) The officer was on a power trip demanding things of them, this shows disrespect
2) A trained officer should have self control, discipline and be "the bigger person" when it comes to showing respect, more so than you can or should expect from a 13/14 year old child.
3) There is a long history of police brutality, this will be a factor in any public perception, and therefore respect earned/showed. This is a factor far before this confrontation.
Office Rambo starting off with a barrel roll and going in all guns blazing is hardly cultivating an atmosphere of mutual respect