SO (Max) does this to some extent, not so much about what he knows**, but what he can do. Really, it is to laugh. According to him, he is a better driver than Mario Andretti, a better skier than Jean Claude Killy, a better gymnast than Olga Korbut (I'm using old examples here, cuz we're old
). If there is anything he hasn't done, it's only because he doesn't want to, but with a bit of training, no doubt he could be at the top of the game in golf, bowling, tennis, whatever
Don't get him started on writers. Stephen King? Horrible writer. JK Rowling? A hack. CS Lewis? A christian apologist and a one-trick pony. And so on, often without having read a single book by whatever author he is ripping to shreds. Really, if he weren't so charming I would have throttled him in his sleep years ago.
**He seriously knows a lot. Genius IQ and fairly well read, he has an engaging, enquiring mind, and 9 times out of ten, he turns out right in our arguments. It's interesting that he is far more modest about his real gifts than his imagined ones