From my understanding, the premise of revolutionary defeatism involves supporting the defeat of your own bourgeois government. I am an American. I am perfectly fine with that when it comes to things like US military actions in the Middle East. However, there has been one enemy the United States has had that is definitely quite different, Nazi Germany. It's pretty much universally believed among the left that Nazi Germany was bad and should never be supported (and that's for a GOOD reason).
But how does revolutionary defeatism square in with something like that?
The second Sino-Japanese War is probably one of the fronts it seems like most Westerners don't know about. While we erase the actual Soviet Involvement in the war, we still seem to know about battle such as Stalingrad and the fact they took Berlin. Most westerners don't even know about the Chinese theater and battles such as Shanghai.
They call it the Pacific theater to ignore the land war, in American classrooms it’s “island-hopping, nukes, and we won!”