I am very very sorry for your friend.
I have seen worse than that. I have been behind riders who have been air lifted in.
As a matter of fact, I have been in worse than that.
I have been scalped, have had a 6x8 section of my skin across the top of my head hanging down my neck. The surgions pulled my skin back across and placed skin off my leg to cover up the remaining bare bone. I have had hundreds of stiches in my face. The nerves to my eye were cut and the doctors said it would never un dilate again so I wear sunglasses all the time. My eye did after a few years start working again, but I still wear the sunglasses.
All this was because I let someone else drive a car one night when I was young and as it turns out they didn't know how to drive. Ya know something...I was not wearing a helmet or gear in the car either. Accidents happen.
I'm not saying someone should not wear gear when they ride. I am as I said before, a firm believer in wearing the proper gear.
What I am saying is they should be able to make their own decisions. Let them know, but let them decide...and let someone enjoy posting pics in peace without having to be rediculed constantly.