For the most part, utilizing racks and/or benches to do certain exercises is cheating as well. I prefer to look around in dumpsters or possibly hobo villages under the bridge for crates, boxes, or, on one occasion three shopping carts stacked on each side to balance my weights on. I usually grab a a few 2x4's to place across a couple milk crates for my bench training. There's nothing like maintaining perfect (unarched for safety) form while being aware of the possibility of crashing into the floor to invigorate your bench training.
As far as collars go, I can see how this hardcore athlete has an issue with such a 'pretty boy' tool to help you in maintaining some sort of INFUNCTIONAL stability with your weight training. Everyone who has any sort of real-world FUNCTIONAL strength knows your loads need to be as unstable as possible or you will only be a strong ape in the gym and not be able to do any real-world movements.
Next time this beast of a training specimen has a break between his rounds of kipping pull-ups or tabata sets of kettle bell swings over head, I suggest you pick his brain and finally get some actual results out of your training instead of cheating your way through life.