内斗 is more than just a word; it's a deeply ingrained cultural concept often lamented as a national weakness. Throughout Chinese history, from the warring states period to the fall of dynasties, the cause of collapse was frequently attributed not to external invaders, but to debilitating internal strife. This has created a cultural sensitivity to the destructive power of infighting.
内斗 is a term you will hear constantly when discussing group dynamics in China.
The term is almost exclusively negative and is used in both formal (e.g., historical analysis) and informal (e.g., complaining with friends) settings.