Van Aanholt, who spent one season under Moyes at Sunderland after the Scotsman took over as Black Cats manager in 2016, revealed the bizzare coaching techniques of the much maligned manager as well as what caused their falling out.
In a candid interview with former Inter Milan and Everton winger Andy Van Der Meyde, the Dutchman also explained how Sam Allardyce helped force van Aanholt's move to Crystal Palace before he was given the top job at Selhurst Park.
When asked about Moyes, van Aanholt said: "What kind of coach is that? I've never experienced someone like that.
"I've had two coaches I couldn't get along with, he was definitely the worst.
"The first day he came, the day before a match we did only corners and free kicks.
"Every detail. Toes need to point down, arms three metres apart, give signals. All that stuff. I thought to myself, is this guy serious.
“But for a hour long. After a while the boys started to get cold.Then the guys started to get annoyed with him, with all his rules.
“He put me on the bench against West Brom, then I came in and scored, I lost my mind. After that he never benched me again.”
Growing tired of Moyes' coaching methods, the 28-year-old told Sunderland he didn't want to play for the club and was sold to Palace for A$25 million in January 2017 after a much publicised transfer saga.
However, van Aanholt revealed there was more to his move than it seemed with his former Sunderland boss Allardyce playing a major part.
“In January my old coach called me, Allardyce. He was about to sign (become manager) at Palace. He called me and said: ‘I’m gonna sign at Palace, you need to come with me’," he said.
“I said I would come, I don’t like it here at Sunderland anyway.
“So I went to Moyes and said I want to leave. He said ‘no, you’re not leaving!’ So we argued, we had a really big argument. I didn’t want to train anymore, I said my family had already left.
“So, I called my agent and he said: 'this is how you should approach him: you should respond to his feelings and say you don’t like it here anymore'.
“I barged in the door, I didn’t even knock. I said: ‘let me go right now! I don’t want to train with you anymore I don’t want to play for you anymore’.
“He said: ‘you’re not leaving, you’re way too important’.
“Eventually, we had an away game against West Brom, so we took a flight. My agent called me and said they’ve accepted an offer they couldn’t refuse. But I still had a game to play, so I called Allardyce and he said: ‘do whatever you need to do tomorrow but don’t get injured...they already accepted the offer so you’re already mine’.
It turned out to be an inspired move for van Aanholt who scored two goals for Palace in the second half of the season and played an important role in helping them avoid relegation.
Sunderland and Moyes weren't as lucky.
The Black Cats were relegated and Moyes was sacked after a horror season where they finished in last place with only six wins from 38.
The Netherlands international said he always enjoyed playing for Allardyce despite the Englishman's unique style.
“He (Allardyce) does exactly know what to do to win...he amazes me,” he added.
“Sometimes he says ‘play the ball into the channel’ and if we don’t we lose and then he says ‘you see! You don’t listen to me!’ And if we do what he says, we win, crazy!
"He used to only turn up to training two days before the game and was obsessed with stats.
"If your stats are high he likes it. If your stats are low he puts you on the bench.
"I played with everything when he was coach, I had such a good connection with him."
