Thanks for the update; it makes more sense now.

I bombed an interview where I couldn't understand the prompt, literally. Like the interviewer spoke it to me, and I restated the problem, and he said "no it's…" and drew something on the white board, and I listened and restated it, and we went back and forth like that for about 15 minutes. To this day I don't understand what he was asking for, only that involved a rate of bank customers and a Greek lambda.

Getting good jobs means pushing your limits and it's therefore a numbers game. Feeling shame from rejection is natural, but also generally unhelpful these days, so it's worth unlearning.