Finally decided to weigh in on the stupid rematch debate,
I rematch when I rematch, I don't when I don't and I assume nothing if others don't. It's a game people. Sometimes I play for a bit, girlfriend wants attention and I leave, or I have to go do something else, or I get bored and feel like quitting. The attitude that you are under some kind of obligation to stay and rematch someone sounds a lot like work. Don't like forced obligations in my free time, get enough of that in real life. Play to have fun when I'm feeling up to it and stop when I don't.
Screw anyone who thinks a person playing a game for fun is obligated to perform and act in a way they see fit for their entertainment instead of just enjoying themselves. If people want someone who will hop to their desires, play the computer it will rematch and replay with you to your hearts content. People are fickle by nature, and it's not anyone's business to judge why a person didn't rematch your ass because honestly you have no clue. For all you know, the phone just rang and they found out their child just got hit by a fucking car, and here you are on the other end of the computer calling them names and assuming bullshit about them. Possibly the person just didn't want to play anymore, also completely viable and allowed.
Even if it was because the person knew they would lose and didn't want to so didn't rematch, that's in the end fine to. It's their choice. See that's the thing about playing with others, it's like a sexual relationship, entirely based on consent. It is completely and totally within a person's right to not consent to play with you, nor are they required to remain in a game session with you because they consented the first time. This whole environment of attempting to obligate people through shame to play how others want is exactly why many games don't do as well as people would like. Few people enjoy that crap or attitude. Life is busy and people play for various reasons and have various ways they have fun doing it. The conform or be shamed attitude is exactly how you chase off potential players.
Someone doesn't rematch, just shrug and move on like an adult.