I rarely even talk to other photographers. To me photography is a solitary activity, even if there are many people present. I like to concentrate on my photography and I presume that other photographers want to do the same. As long as I am not interfering with anyone, I expect to be left alone.
If someone came up to me and asked if they could borrow a piece of my equipment, my decision would be based on the value of the equipment. Since most photographers can run faster and longer than I can, there is a definite risk on my part. In any case, if I do lend out a piece of equipment, I would have to stop my photography and wait for the photographer to get done and return my stuff... kinda interfering with my photography.
I have not had any stranger ask me to borrow a piece of equipment of mine, but then honestly, I try to exude an attitude of "I am trying to concentrate here, I am really not the person you want to talk to right now".
Other photographers treat photography in a more social way and that's great for them. I don't get a lot of time to go out and take photographs so when I do, I want to take photographs.