I must gone through all the points listed in this article throughout my 20 plus years of working in the IT at different levels. Human beings are born with ego , some display it explicitly, some others in other ways etc. No one on the earn like another person who is not at the level to know more or to know what the other person does not know. This is the general resentment and bitterness which is faced by IT support and related person.
Like the article I have so much to share and it can continue pages into pages. But I end here.