The Scot received boos and jeers when he returned to Everton in April 2014.
The Scot had spent 11 memorable years on the blue half of Merseyside before taking up the unenviable task of replacing Sir Alex Ferguson at Old Trafford in 2013.
Neither act went down particularly well at Goodison, and the supporters let him know what they thought of him in April 2014 when Moyes's United were beaten by Roberto Martinez's 2-0.
The 52-year-old had done an excellent job at the club and consistently helped them challenge for European football season after season despite a meagre budget, and Moyes admits that the booing and jeering upset him.
"I wasn’t surprised, because I know how supporters react and I had left their club, but I was disappointed. I got Everton competing at the top end of the league with a mid-table budget," he told Four Four Two.
I gave everything I could in trying to make Everton the best I could. It was a long process but we did it – my staff, players and others at the club. We had some glorious nights at Goodison and the fans were superb.
"I’ve got huge affection for Everton – it was my life for over a decade."
To add insult to injury, Moyes, who lost his job at Real Sociedad last year, was fired by the Red Devils just two days after the defeat at his former club.