Guilty conscience about what? I use spinning gear. I'm not ashamed of it. In fact, just the other night I caught a huge Rainbow on the Bow with my untra-light spinning setup. While most of my fishing is done with a fly rod, I'm certainly not afraid to pull out my spinning rod. If that makes me inferior, in your not-so-humble opinion, so be it. We will never be fishing partners and at this point I'm not sorry about that.
I don't condone the use of illegal equipment; never have and never will. Your initial attack seemed to be weighted much more heavily towards the style of fishing, not the equipment being used in that particular situation. I was merely defending the style of fishing, not the illegal equipment.
Fly fishing only waters? As Rickr posted, is there really a difference in the trauma to the fish? I might point out a fish caught with spinning gear is generally landed much more quickly than a fish caught with fly gear so will toss out that a fish has a greater chance of recovery when caught with (legal) spinning gear. I can tell you I landed and released that Rainbow in half the time than had I caught it with my fly rod.
I have two sons. They have been exposed to all kinds of fishing, from jigging for perch over the side of a canoe in northern Saskatchewan to flyfishing for Cutthroats on the Livingstone. As Rickr pointed out, it is the experience, not the method, that is the valuable component of those outings. I could care less what style of fishing my son(s) choose. If they want to come fishing with me, it's a good day. I see it as unfortunate that you have chosen to pass on your elitist attitude to your son.