this whole "young people are all jerks" attitude you have is very annoying to me. my son is 20 and has more sense and customer service ability than most people twice his age. age doesn't equal smarter, it just equals older. if the cashier is so smart why isn't he the manager? this manager was doing his job as he saw it, maybe a little over enthusiastically and possibly a little rude. just knock it off lumping all young people together.