If you are playing chess online, generally you have time for at least another go around. From my encounters, people refuse rematches because it gives them a sense of power. Sure the person requesting the rematch may have some type of ill placed vendetta to seek revenge after losing, but this isnt wrong to want to replay a game.
I think if you have the time you should always accept a rematch. it shows good sportsmanship, most chess tournaments in the GM level and below are strings of games not only one. Don't be an a** hat and accept the rematch
Was just wondering this.. I'm very competitive so I love rematches but it also irritated me that most players don't accept rematches. If you want a rematch because you lost well that's completely your fault and you have to own up to it.