That is not just beyond arrogant. It is ludicrous.

Anyone putting forward such blatant nonsense probably doesn't know very much at all, or they would have a better sense of perspective on knowledge. You sound like a textbook example of Dunning-Kruger effect.

Even the most knowleadgeable of us know but a tiny fraction of what it is possible to know.

Unless you live in a bubble populated by boring clones, the overlap with what *any* other person knows is likely to be very small. Even when that person doesn't know much.

I'll challenge you any day of the week and teach you 200 things you don't know before lunch, or before you listen to your podcasts at 3.5x speed... <insert massive eyeroll here>