They seem pretty far by the time delay of the bullets being shot and hitting the targets and when they zoom out it looks far.
An Apache is designed to engage targets from a very great distance to avoid it being under threat from RPG's and the like. Which is obvious from the delay of the firing and the shells hitting the targets.
I don't think one has ever been shot down (recently at least), one was hit, and the pilot didn't even notice until they landed and there was some damage to part of the chopper.
With regard to the video, as has been said, the language and attitude does seem quite harsh, however, unless you have been in that situation, with your life on the line (not in a Helicopter but that might not be the only thing you've done) you really can't have any idea of what it's like.
As far as I can see, the guy leaning around the corner could well have an RPG, as it looks like it is over his shoulder, although they should have waited longer and verified it more clearly. Some of the other guys "appear" to have what look like Rifles, people saying they are obviously cameras are probably only doing so because they know what they are beforehand.
Most people sat at home chilling watching TV/on the computer in England and America have no clue what war is really like (I don't either personally). I can only expect you and your mates are bound to have a bit of a banter about events, and you probably will be slightly desensitized to the situations that unfold before you.
The only bit that seemed quite out of place was when he was hoping the guy would pick up his gun, however, at that point he assumed that he was a terrorist, so would have wanted to finish him off, for a variety of obvious reasons.