The world without "hegemony" is a world full of empires that created Colonial competition and World Wars. Slaughter and mayhem was the norm. This was the world when America isolated from the old world. After World War II the world quickly faced a Soviet Communist path. Only the U.S. could compete against this, and with our way of life in jeopardy, so we did and prevailed. Today, we are the last standing "empire." It's been a bumpy path that the old world provided, but we travel it better than anybody. We've been paving it ever since. You should be thankful that nobody else stands to suck the world into World Wars anymore.
Look at it another way....
You want to know "a" reason that the old world looks down upon us? It's because we proved to be able to do what they proved they could not. Being the world's most powerful nation after World War I, we shared this power and created the League of Nations for or so called "parents" in Europe so that they could finally have peace. Proving incapable with World War II, we again launched across the Atlantic Ocean. This time, being the most powerful nation in history, we shared or power and created the United Nations. No one before us ever shared power like this. No one before us ever cared to do anything that would humble absolute self-power.
Hegemony is a vicious word used by people who have twisted history to fit a cynical idea of the world they live in. "Hegemony" has saved the world from untold travesty. You may bitch about Vietnam or Iraq, but try accepting that another World War could have easily replaced such smaller events. The world without American "hegemony" cost hundreds of millions of lives. Another reason why the old world hides its embarassment behind the lie of disgust.
By the way, do you have any idea how many empires went down just in the 21st century in events that you do "support?" Do you realize that those events went towards today's "hegemony" and cost far more lives than anything else put together? Once again, I call out your idea of your "morality." Killing is a part of war. And whether you support one war or another, it is all murder so let's not pretend that you can choose when and when not to apply your sense of "morality." Your "morality" is either solid or it is wavering to your personal agendas of support.
Understand your world and your nation's history and you won't waver so much. And given that hypocracy is human nature and it is the only way to survive or prosper in this world, accept a bit of that too.