That's just an adolescent, ignorant response, IMO.
And in my opinion you're an asshole trying to stir people up. You introduced the analogy of climbing with an MLU and swimming with a life vest, not G spotter. He just pointed out the shortcomings of your analogy. Just out of curiousity, since your the badass lifeguard, who the hell do you know who actually swims with a life jacket on? I can see paddling/boating with one on but swimming? Give me a break.
As for the MLU, oftentimes extra safety equipment can lull someone into a sense of complacency, taking risks when they shouldn't. They were used mostly for body recovery around here. Cell phone coverage used to be excellent all over the mountain until the switch to digital.