Cancel culture is when a mob of people, usually on Twitter, most of whom have no direct relation to the institutions in question, try to create a bunch of bad p

Cancel culture is when a mob of people, usually on Twitter, most of whom have no direct relation to the institutions in question, try to create a bunch of bad publicity for a target at an institution for the purposes of making that institution decide to cut ties with the target. I think JPKab is saying that an NVIDIA employee mistreated someone who is effectively a prospective customer for NVIDIA (or who is working to create prospective customers), and that this by itself should lead NVIDIA management to fire that employee even in the absence of public attention to the event.