I agree. No one likes to lose. It hurts to lose. It's deflating, sometimes depressing. Still, when a mature person loses, although they may feel down, they accept their defeat. Instead of focusing on the outcome, they focus on the joy they had playing (as they say, the fun is in playing).
trump is a poor loser. he never learned to accept defeat (let alone admit it) and thereby learn from it. he sees it as humiliating, reprehensible, and a sign of weakness. So instead of humbly accepting the outcome and being a big man, he grovels and whines. “I was cheated!” “It was rigged!” “Foul!!”
It would be so much better for him (both how he feels inside and how others see him) to suck it up and be a man about the matter. He can’t see that his whining and griping only serves to make him look like an even bigger fool than he already is. He has the chance to go out like a man (shoulders held high), but instead, keeps acting like the spoiled brat he is.