The real problem with the Princess's line.
It's not that it's "inappropriate" or "ruins it" or any other colossally stupid reason that I've seen here so far.
It's that, before that scene, the Princess had been portrayed as a strong woman willing to be imprisoned rather than go along with an evil plan. Then all of a sudden, she's a floozie just for a cheap laugh. This after two other characters point out that it's "not that kind of movie". How about, "Save the world and I'll get you a lifetime supply of Volvos and free merch from IKEA forever." Now that's a princess with strong negotiating skills.
"Well, for once the rich white man is in control!" C. M. Burns