The Challenge

Hello all, I never understand chess players who back down from a challenge...you only back down maybe when you lost a few times but if you win and not accept a rematch is bringing shame to chess players. I competed so many sports but only you can find so many competitor chess players that back dowm from a challenge (chickens)...it's a shame because I'm a chess player with a spirit of being competitive.
Anybody keeping track of how many times this sob story has been done?