Hoosier Hills gun club outdoor range in Gnawbone? I have been thinking of joining.
If it was that club I would bring it up at a meeting for sure. Those are a great bunch of people and I'm sure they wouldn't tolerate unsafe range practices from members. They would probably be ex-members quickly. I went to 3 matches there and a meeting last year , but haven't joined due to the distance from my house. From what I saw of the members there, I wouldn't hesitate to join were it more convenient for me to get to their range.
I agree that the situation the OP describes sucks, but I would say that common courtesy is far from dead...at the shooting range anyway. It's unfortunate that there are a few bad apples out there.