The Vid is in Brazilian so I can't tell what the guy is saying ???
At the beginning he says "bro, we arrived at Disney, look at that"
"look at that little girl"
Another one actually notices that she was on to them and feeling bad, they were probably making fun of them before the video.
And another one goes "It looks like a horror movie"
The other guys, including the girl pinching her nose, are going to get theirs too.
The fucktard is trying to save face, making videos saying he didn't know she had cancer and he thought she was dressed for Halloween.
The little girl's outfit was the character from the Monsters Inc. movie, which came with a wig, which she was using to hide the hair loss because of the chemo.
But even if the little girl was ok, just the way they made her look uncomfortable and ashamed was enough.