"If you peak too early it's too predictable," he said, adding that he would have given the former journalist a three out of 10, as opposed to Horwood's score of one.
Thorburn and De Angelis scored a total of 10 out of 30 for their waltz to Feeling Good, with Horwood's single point added to a five and a four from fellow judges Sharna Burgess and Tristan MacManus respectively.
"Well, it was all going well until the skirt was ripped off and you started to dance," Horwood said once Thorburn and De Angelis finished their waltz.
"Then, quite frankly, it was a failure."
But Horner, a former Broadway performer who now works as a real estate agent, said that Horwood was being overly harsh.
"He's a judge on a glittery dance show that needs ratings to survive - and pay for that fabulous set," Horner said. "He's doing his job. Was it a fair comment? No. She deserved more than a one. But from failure comes drive and success.
"If only Australia could vote and score the judges comments then I'm sure we would all deliver Craig a passionate score of one - and it wouldn't be with our paddles, it would be with the back of our hands and one finger pointing up," he joked.
Many viewers took to Twitter on Monday night to share a similar sentiment.
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Thorburn took Horwood's comments on the chin, thanking him for "being so kind," while host Amanda Keller acknowledged how tough it was for her to take to the dancefloor in the first place.
"It took a lot of convincing, you had to think long and hard to make your way out on this dance floor," Keller said.
Thorburn replied: "I was a mess a couple of days ago ... It has been really worth it. I felt beautiful, I felt confident, I felt happy."
Courtney Act topped the leaderboard after scoring 23 points out of 30, while former cricket pro Sir Curtly Ambrose ended up at the bottom alongside Thorburn.
Amy Croffey is an entertainment reporter at The Sydney Morning Herald and The Age