His refusal to shake hands with Tony Ralston, an 18-year-old lad who he had been up against in a good, honest battle all evening, just reeked of a lack of humility.
So off he went to PSG to become the biggest dog in a slightly smaller pond, I may have mixed something up there.
We're in the era of superleagues and superclubs so we better get used to it because it's here to stay and will only get worse.
Feyenoord won the Dutch league but were swatted aside effortlessly by Man City - a team who were nowhere near winning the English Premier League last season. He's smart and he knows that it's very important.
Despite Neymar and Ralston's animosity during the match, the Brazil international refused to exchange shirts with his opponent because he had already promised his to the Marina Dalglish Appeal - not because he wanted to continue the argument.
From Celtic's perspective, the whole group comes down to a home-and-away shootout with Anderlecht.
It doesn't seem as if Cavani will be quite so accommodating. "Concerning Neymar, it's a little bit more difficult".
The Brazilian superstar should realise that he is a role model to children all over the world, and that these youngsters will look to follow his example.
"With the quality they have, I think it's easier".
If that meant sacrificing someone up front - namely me - and sitting in to frustrate and then hit teams on the break, then that's what he did.
Brendan Rodgers isn't that kind of manager, he has his own style and that's what he believes in.
Back in 2015, Neymar said he was left "speechless" when Messi let him take a penalty in Barcelona's 8-0 win over Cordoba.
For the first time since the prime years of Zlatan Ibrahimovic, PSG are a truly feared team.
Yet much has been made about Neymar's quest to win the Ballon d'Or and SFR Sport claim he has privately been complaining about being behind Cavani in the pecking order, thus denying him the chance to add some extra goals to his tally.