Let the Wookiee win.

The page quote (and semi-trope namer) comes from Star Wars: A New Hope, when R2-D2 is playing and beating Chewbacca at dejarik, or holochess. C-3PO's advice to R2-D2, "Let the Wookiee win", has become a proverb, especially on the Internet. It means "With nothing substantial at stake, it is best to give way to whoever cares the most". Proponents of this principle argue that a lot of time and energy is often wasted on trivial arguments just because people can't stand losing. Opponents argue that it could lead to the enabling of an abuser:” an extreme example would be Britain's appeasement of Nazi Germany in the run-up to World War II.

Example of:
Let the Bully Win