Obviously, he acts as he sees fit.
And you need to prove something with the game. And if there is a desire to prove something, to find out who is better, then you can calmly organize a match, discussing the conditions.
Added 5 minutes later
What do money have to do with it?
Fedor Emelianenko doesn't have to punch everyone in the face every day to prove he's the best. Michael Phelps doesn't have to race everyone. Magnus Carlsen doesn't have to move pieces with everyone who says, "I'll beat you, you don't know how to play."