He was asking for it when he changed his tone of voice. He could have said that all to the officer in a much more calm manner and made a much more valid point.

For all the officer knew, the guy was tripping out on drugs, so in effort to ensure public safety the officer arrested the guy.

Officers are no above the law, but they do enforce the law that is written. Part of those laws is that the officer is entitled to ensure his own safety as well as ensure public safety.