Well, if I were out shooting with some peer photographer, then if I see him do something weird, like throw the lens into a case without any thought, I might inquire if that was secure.
However, I was out shooting a wedding with a much more senior guy (probably even older then you, Belmondo!). I didn't feel that I was in any position to be questioning his techniques. But then, a month later, when we went to shoot another wedding, I saw the fast lens and its front surface. I inquired and found out most of what happened.
I just hate to see that happen to anybody's expensive equipment, even if it is a Nikon, and I try to learn from that, even if it isn't my problem.
---Bob Gross---

