Why chess players are changed?

I experienced also rudeness on OTB games, but not directly. For example, in my chess club I saw a girl who, instead of give mate (there was mate in 1), continue to play only to fool her opponent without giving mate. But I experienced also directly, for example I played against a guy in chess club who make on purpose weak move like hang his queen to fool me because I'm a beginner.

Because of the internet. Blame everything on the internet, it is what introduced many swear words to the moronic masses of our generation. Don't even get me started on children using swear words. (CoD, educating children on swear words since 2009) Not to mention many people got affected by the others and their stupidity in the internet. Basically, the internet is the cause, and the effect is such. :-) 

The internet is the average folk's most powerful weapon. He can use it to advertise whatever crap he wants, no matter how stupid it may be. For example...memes. No finer example than memes. The teenager's favorite weapon! Deny me not.

How do you know that girl just didn't see the mate in 1?  Or maybe she was enjoying the game and wanted to keep playing?  What if the guy you were playing wanted to give you queen odds?  I don't see how hanging his queen or making other weak moves because you're a beginner is being rude.  He may have just been trying to give you an advantage because you're a weaker player.

Also if he laugh and pretend that he didn't see his queen hung? And the gilr SAW the mate, but she just want to fool her opponent.

...I really can't take this thread seriously.

OK so how do you "fool" someone by hanging your queen or not checkmating?  Perhaps this is some new level of play I'm unfamiliar with... fooling your opponent into a false sense of security by committing major blunders?

I mean kid his opponent. Wrong english.

Ok do you mean just Rubinstein? Or Rubinstein and his pet fly?

http://www.chess.com/article/view/not-only-chess

"On page 27 Abrahams tells of the story that Akiba Rubinstein (1882-1961) was obsessed with the feeling of a fly walking on his scalp during a chess tournament at San Sebastian, Spain in February, 1911. At the end of the tournament Jacques Mieses took Rubinstein to a leading psycho-neurologist in Munich. The doctor told Rubinstein that he was mad, but what did that matter. Rubinstein was a chess master. "

Not that there's amything wrong with that.

Still, nuts and nice people today, nuts and nice people back then.

Take me for example - I play chess and I am not nuts, and usually nice. That is, unless you do something completely unexcusable; for example, if we are playing and you type a message that contains the letter "R" in it, then of course I will get angry.

Rubinstein suffered from a serious mental illness. I was talking about the rudeness of today's players

Maybe those 2 players you played against were also mentally ill? Don't be so quick to judge.

That is a huge generalisation, it means you are calling everyone here also "arrongant" and the many other negative adjectives. Its not necessarily true at all, many people I play with OTB at university are usually nice and polite, though yes you do the odd dodgy rude character on live chess, but then again, what internet chat platform isn't prone to trolls? 

Alekhine once resigned a game by taking his king and throwing it across the room.  It was once reported that Alekhine would go back to a hotel room and smash the furniture when he lost.

Alekhine divorced his second wife because she would not accompany him to chess tournaments.

Are these the actions of a well mannered person?

Internet anonimity can bring out the worst in some people.

Yes, in order to keep up the illusion that he hung his queen, he laughed and pretended.

Did the girl tell you all of this?

"… I recalled the story about Alekhine, who after a lost game, threw his king far away. Though I am far from Alekhine's genius, I could understand him at that moment.  -  Borislav Ivkov"

Truly.

Even I understand him at this moment. (but far too far from his genius). People are not perfect, and not even half are well-mannered. How boring it would be if everybody was.

If you associate chess with genius, then it is wrong. Very wrong. Chess is just like other sports, genius or non genius play.

Generalization is a very wrong thing to do.

You must select who you play chess with

I have a friend who is very well mannered and I've seen him smash furniture when he's angry.  If he decides to break something in anger my thoughts are along the lines of:  At least he's not breaking somebody.