It is a procedure when after you finished the match, you will have to shake hands with your opponent. However nowadays people tend to blame their opponents for everything when they had lost. It was said that "when you win, win with grace. When you lose, lose with pride.''You should be not be blaming them and instead, you should just shake hands and admit your lost.
I think that people nowadays are too negative. They should learn to be positive and start to reflect on the mistakes they had made. They had taken things for granted, thinking that it is always there but they were wrong. If they had lost, they should lose with pride.