And finally, you hit some truth. Yes, being disrespectful means different things to different people in different contexts and in different areas of the world. If someone turned to me in public and said "hey buddy can you pass me that thing", I wouldn't think twice about it. I'm guessing someone from Brooklyn (e.g. @BrooklynMan) likely calls people meets on the street buddy as a matter of course.
But go ahead, feel free to keep taking offense to anything you like. You're not obligated to have a good reason.