This is football! football is entertainment. you don't kick a player for embarrassing you on the pitch, you try your best to better him and if at the end you are unable to, you be a good sport and give him his respect.
I don't care if Neyma is the biggest cvnt in world football he doesn't deserve to get kicked.
You're looking at it from the perspective of a fan, who has no personal stake in what is going on.
They are going at it from the perspective of competitors, competing in a competition, where for you might want to be entertained, and therefore you want someone like Neymar to be protected so he can dazzle you. The other guys on the pitch might have other desires. Like winning. Like doing whatever is necessary to win. If that means pragmatically fouling someone who can outskill you, that's what you do in THAT situation. You don't throw you hands up and say "Oh well, he's better than me, I guess I'll just stand here with my dick in my hand".
I also can almost promise you, you'd have a different opinion on this if it was Jones fouling Neymar for United. Most people would come to the defense of Jones. Saying it showed loyalty and honor to sacrifice himself for the team. Ultimately these are professional fouls. If OUR defender hauls someone down from behind on a clear cut break away, we applaud him. He gets red carded and DDG saves the penalty, we salute him. If someone does it to us, we're horrified, this is the most despicable act! He should be banned for life! Or at least a few games because JUSTICE!

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Neymar does need to man up. Imagine how much more impactful he'd be if he behaved like Messi. You have to hack Messi down to take him down, AND he rarely flails about. He pops back up. Neymar often just swan dives on the slightest contact, and then writhes like he's been shot. How often does Messi ride out a foul, and then do some highlight all world all time great type shit? All the time. How often does Neymar ride out a foul and then do some all world shit? Never know because he never rides out fouls. Also, Neymar has a reputation for diving now. The Refs never know with Neymar if he was axe murdered, shot, or a stiff wind caught him and he dove? When Messi goes down, because he doesn't go down easily, it's almost a no brainer for the refs.
Anyways, that's the game. These are men, competing, foremost on their minds is competing and trying to win. Not if their actions hurt the on-field product for a TV audience.