What's the point of blaming a Messi, and I think it's a very funny thing if the fans only blame a Messi who basically always plays pretty well in the team he's defending now. Because the good and bad of a team depends on whether or not the people in the team are solid and that also includes the coach, so it is very inappropriate and very funny to only blame one person whose profession is a player.
I think that he doesn't even wanna try to blame messi but he was only pointing out how good the performance from messi. PSG fans booing caused by they disliking something from messi. messi already decided to leave from the club and move back to the barcelona again. That means if messi will not stay even longer in the PSG. The problem is barcelona has not finished yet with its financial problem.
Neymar had the same problem like messi which under conflict with some players even the club itself. There might be a reason why the fans of PSG were blaming him.
It may be related with something that we didn't know about.
So many negative news has been reported by france media regarding messi with PSG fans.
In fact, I consider Neymar an unlucky player. Neymar is basically one of the players in the world with great skills, but a third of his football career has been spent with injuries which is very bad for his career. The current Neymar is probably injured, these days Neymar is unable to play any role in the big matches.