Some pundits suggest the presence of the former manager at the Reds' games puts pressure on his successor but Moyes says such claims are wide of the mark.
The manager told MUTV: "It tells you that people don't know me, they don't know Sir Alex. People are only saying it because they have no idea about how it works.
"Sir Alex has been fantastic, incredibly supportive, he's only there to help me. I have a conversation with him when I need it. I tend to see him for a minute or two after the games, we'll have a chat and I've found him great."
Sir Alex sat with club legends Sir Bobby Charlton and Bryan Robson at Sunderland last week and the TV cameras panned to the trio when the final whistle sounded on the Capital One Cup first-leg defeat.
"All the people around the club... Sir Bobby, Bryan Robson, all the former players in the main have been great," added Moyes.
"But obviously there are a lot of people who are out there trying to twist their words or make it look as if there's some problem. I've got no problem at all with it [Sir Alex attending matches]."