"I think we all know Julianne and she is a huge advocate for being kind," Derek told ET's Carly Steel at the Motion Picture Television Fund's "Night Under the Stars" event in Los Angeles on Saturday.
While the 31-year-old dancer said he felt his sister was "100 percent" misunderstood, he said he appreciated why Rose felt the way she did about the comments.
"You get your feelings hurt when you're on the show," Derek explained. "I understand she felt bummed out."
"But to say [Julianne] was [body shaming] is definitely just false," he added. "Julianne's the complete opposite of that, and she stands for everything that's [the opposite of] body shaming."
"All the beautiful professional dancers that are on Dancing With the Stars, I mean, they dress very sexy and they do the splits and they grind up on these guys and they look absolutely stunning and get a standing ovation," Rose shared. "And me, and my body, my hips, my a**, my breasts made her uncomfortable."
"I have been a strong proponent of female empowerment and an anti-bullying advocate for years and I take that very seriously," she said. "Any kind of body shaming is the furthest thing from who I am and what I stand for."
Derek admitted that he doesn’t know if his sister and Rose have had a chance to hash out their differences yet, but said, "Knowing [Julianne], as soon as she's in town, she'll go right up to Amber and she'll be like, 'Listen, I hope you know what I mean. Let's hug it out.'"