You're correct, we cant control what our friends say but, she can control what she publishes in her vlogs, and she obviously thought the comment was acceptable to have included it.
I personally believe she found it humorous which is why it was left in.
Think of all the footage that was likely recorded that weekend. She then has to go through it and select what she feels good enough to make it into the vlog. In that particular clip lasting all of a few seconds, absolutely nothing else happened. They were crammed in a lift. The only thing that did happen, was the KKK reference. She selected that part of the footage for a reason.
I personally believe she found it humorous which is why it was left in.
Think of all the footage that was likely recorded that weekend. She then has to go through it and select what she feels good enough to make it into the vlog. In that particular clip lasting all of a few seconds, absolutely nothing else happened. They were crammed in a lift. The only thing that did happen, was the KKK reference. She selected that part of the footage for a reason.