I very rarely click the rematch button.
But when I do, it's more usually after a loss. I would only want a rematch after a win if the game was very close and interesting to me for one reason or another.
However win or loss, when asked for a rematch, I will give it... and usually more than one. The only exception is if they're rude. Rudeness can be either in chat, or for example stalling the game when the conclusion is inevitable.
Nobody is kind in Bullet or super blitz 3 min. You can feel agression, you can feel he is nervious or unstable or he does not know what hes going or he is cracked and when is right to push.
Very very rare (1 in 150 games) i find someone to type : Hi or gg.
Go to someones profile - 80% chance you will find bad words about him. Some time even with no reason.
I never type hi or gg. In fact when I see it, I take it as a sign they're unfocused or weak 
I only play 3/0 online... obviously not right now hehe. My internet connection is really terrible. It can take 10 seconds to load this topic for example...
Oh yeah there are people who offer rematch only to see if you are scared. You accept and the guy aborts and run. Now thats fun.
Yeah, that's really bad manners. I never do childish stuff like that.
When I played here in the past I disabled my notes and disabled chat before the game began. I think that helped avoid a lot of it.
Rated fast games. 1-5 minutes.
You lose , you run. No rematch. Thats the rules everyone follows.
You win? Then spam rematch button, if lose next game - run run run. All games are about rating points.
And i am not talking about patzers with no life. It is the same even with people who are FIDE Arbiters and Trainers (personal experience) or anyone.
Chess com should do as Fide Arena server - add option for a match - minimum 2 or more games if you run 2nd you lose game.