The discussion centers on the challenges of defining mass without interaction, highlighting that in classical mechanics, mass is often seen as a proportionality constant related to force and acceleration. Various participants note that mass is fundamentally linked to energy, with some arguing that mass is a property of matter while others suggest it is a product of energy. The conversation also touches on the role of gluons in the Standard Model, where the majority of baryonic mass arises from binding energy rather than the mass of individual particles. There is skepticism about existing definitions of energy and mass, with some asserting that these concepts remain undefined and problematic. Overall, the thread emphasizes the ongoing complexity and uncertainty surrounding the nature of mass in physics.