It’s not. It’s a recognition that you have to act within the world as it exists today.

That doesn’t mean you can’t work to change the world, and in fact in order to do so you first need to see how it actually is.

But it does also means you need to decide which battles to fight.

The comment literally just said "you can't worry about it, it's the world we live in". That's the point, you can't just use the second part as an excuse to not fight battles or changing. Because that sort of requires worrying about things.