Chess makes people mean, unfriendly, and nasty

This is strange. Saying "good game" to your opponent after you defeat him is a mark of being humble in defeat.  That has been true of all sports since ages. After a hard fought game, footballers ( and you can name any sport here ) come together , shake hands and say good game, well played etc. If you take it as a sign of obnoxiousness, that is not what is meant when it is said. 

This could be one of the examples of a culture clash. In most sporting cultures, saying "good game" is a sincere remark. Some of the recipients of such a remark might think it is sarcastic , but often times it is not, it means just what it says. He is sincerely meaning "well played" or "nice game"

Agreed. It's just courtesy, really. And it doesn't make you obnoxious if you say it when you win cause you might really admire the effort the losing opponent put into the game (and we should all admire each other's efforts to learn and become better)

It has everything to do with the "citizen quality" of a place.  You almost never run into an opponent from Taiwan or Japan who is nasty (except for foreigners living there) because having manner and being polite in those places are considered very important.  But in many other places in the world, being nasty and impolite is the norm, and being in the cyberspace just make things even worse because people don't have to be responsible for their behavior.

Let me type slowly, so you with your abysmal intellect can keep up. Exactly, how stupid are you?

Let me educate you. You can dispute my opinions, NOT my FACTS. When I say that I gave him a friendly rematch, that is a fact, not an opinion or a "viewpoint". How the hell can you question my motives, you blithering idiot? You dumb schmo, you do NOT know what an "opinion" or a "viewpoint" is. It is the anonymity of the Internet that allows demented pieces of crap like you to be be aggressive, argumentative, and obnoxious. Basically, just another troll with a VERY wrong idea about his intellectual abilities.

But, I have to tell ya, I'm so far beyond incredibly nasty.

No, you listen up, you piece of crap. This comment is absolutely hilarious. Like you don't know what opinions and viewpoints are, you don't know what "playing a victim card" is. Who is playing the victim card? Don't use big words, idiot. I am calling you out for being just another overly aggressive, obnoxious, anonymous Internet troll.

And, yes, it is my opinion that in claiming "we", you are trying to generalize your absurd nonsense. No one else has questioned the simple fact that I gave the guy a friendly rematch. He didn't. Whether that was meanness or something else ... that is an opinion or viewpoint. But you are too stupid to understand. And in addition to being stupid, you are annoying, obnoxious, and abrasive.

I'll repeat ... you have to be incredibly and monumentally stupid to question my facts and motives! That is, of course, beyond your abysmal intellect. Your stupidity is egregious.

Now, GET LOST, you anonymous sissy.

I cannot believe how heated people are getting about a rematch when there are literally a million other people to play. I thought this was supposed to be a fun hobby. 

Imo it's supposed to be a fun hobby, and I agree with you. However, I've found that there's a very large demographic of intermediate players that think they're better than they actually are and take it waaayyy too seriously

I never accept rematches,  too often the opponent was raging at losing the first game and resorts to cheating in the second to try and get revenge.

You can almost feel the hatred in the second game.  When I start a game with someone it is just that, a single game, not a multi game match