You should travel more and ask people outside the US what they actually think about US military policy. Note, some people do distinguish between what the US establishment does and what ordinary American civilians do but that is not always the case.
Maybe you need to travel more? You hear "Americans are hated" by.... Americans mostly. And, I would guess, Americans of a certain political bent that say it more as a badge of their identity rather than it being an honest belief in the truth(literally "America's #1!!!", but for liberals). It's a grade school level understanding of the world(as is "America #1") and I find it a fair indicator of stereotype-oriented thought patterns when I hear it.
By the way, I am not an American and I don't live in the US. So I have a perspective on this which you probably don't have.