Many people, in particular men, have an inherent drive to compete, to immediately rank themselves against any stranger they meet (using whatever criteria they use to measure superiority), to establish who is top dog.

It's like asking the question which of the two gunslingers is faster on the draw, even it it is by a millisecond, which sprinter can cross the line first, who can hit the ball further, who can benchpress more. Etc. Etc.