The former Arsenal and England star added: 'If a player gets sold in summer, they wouldn't leave Manchester United crying.
He said: We showed clearly we were playing to win the match.
Moyes has endured some hard seasons but is certainly helping West Ham dig out from the bottom three.
There was a more subdued atmosphere from the home fans at the end of another deeply frustrating campaign for the Hammers.
West Ham defender Pablo Zabaleta insists he's happy where he is.
Mourinho reacted to Friday's meek 1-0 defeat at Brighton by making eight changes with Marcus Rashford and Anthony Martial relegated to the bench despite the continued absence of the injured Romelu Lukaku.
"I came to enjoy my last few years in football in the strongest league in the world and so hopefully have one more good year at West Ham".
Mark Arnautovic was the sole bright spot for David Moyes' team, regularly beating his man easily but found himself isolated too often and David de Gea wasn't truly tested over the course of 90 minutes.
The Frenchman had initially been chopped down by West Ham midfielder Cheikhou Kouyate which went unpunished by referee Jon Moss, with Pogba taking out his frustrations by deliberately tripping Noble.
Jesse Lingard forced Adrian into his first save moments later.
"When I watch United play, I literally think if it's just going to happen, they're going to fall over it".
Mourinho has admitted his squad needs improvement, but Merson believes he should be more anxious about players wanting to leave Old Trafford.
Pogba's frustration then spilled over when he was lucky to escape with just a yellow card after grappling with West Ham captain Mark Noble as tempers flared in the latter stages.