Nothing in the world is that simple. I don't believe the US should be pushing our values onto other countries, but there are lines that shouldn't be crossed. We shouldn't be going out alone when these lines are crossed. Usually when a line is crossed, there are many nations that feel something must be done or said, I mean that's a big part of what the UN is for.
Now for the Australian - Oprah example you gave Mooshi. I don't see that as US pushing its values, it was a few idiotic people pushing their values. I want our country and others to stand up against things like the systematic rape and murder of the people of Darfur, not for the removal of a doll that someone finds offensive.
The US has gotten involved in many things in the past that we shouldn't have been involved with. We had no business going to war in Iraq under George W Bush (We did have a legitimate reason under his father, but his father was smart enough to realize that removing Saddam from power was going to a huge mess and didn't go there). Discretion is necessary if we are going to step in somewhere or push or view. And though we haven't used the best discretion in the past, doesn't mean we should never get involved.