The Ligue 1 giants were heavily favoured to reach the quarterfinal stage after going up 2-0 in the first leg against United.
They lost 3-1 in Paris, with the winning goal coming from a VAR awarded penalty. And Meunier wasn't impressed.
"The match against Manchester [United] is just the biggest joke in football history," Meunier told Le Parisien.
"I could have put a million euros that we could not lose. Not to qualify, it was really catastrophic. Everyone is well aware of this.
"The Champions League is still the major problem. The communication was made about this internationalization, about winning this competition, to be part of the big ones like Real, Barça. It will take a long time for that, but PSG is a club that grows."