"I was all good to go, got kitted up at the venue, sweet as, then a Kiwi official, Chris Samson, told me I should have shaved."
Hopman was disappointed the Black Gloves team management had not warned him about the facial hair ban, which he guessed was to prevent beards being used as an abrasive advantage in clinches.
He decided he would take his disqualification with grace.
"I was in medal contention and was going to get a bronze no matter what happened but, for me, I haven't got a medal. It's not the way you want to get it," he said.
"But if I'd thrown my toys out of the cot, I would have just made myself and my country look stupid. Our team was made up predominantly of young people and I felt I was a role model, pretty much, so I just had to take it with some dignity."
He said the Kiwi team of 40 fighters had performed well, taking 21 medals that included a Junior Girl Gold Medal for young fighter Crystal Cook, and fellow Masterton fighter Kahn Warwood had fought well despite his exit in the first round of his division.
He was grateful too that neither he nor any members of the team were caught up in the bomb blast that rocked Bangkok during the tournament, killing 20 people.
"We didn't get blown up - that was a bonus. I was on a train heading to the stadium when the bomb went off about 500 metres away from us. The train stopped and we weren't allowed into the station for a few minutes.We felt the explosion."
Hopman is considering making a bid at the 2016 Muaythai World Championships in Sweden and at K-1 kickboxing world champs in Spain later next year.
He was also looking at opportunities to fight in an upcoming King in the Ring televised match and an International Boxing Organisation Oceania title fight.