Heck, I'm in the military, and I hear stupid advice all the time.
"Watch that weapon, Sergeant. You'll have an ND and bring down the whole airplane."
"Load nothing but tracers in the bottom half of your mag."
NRA Life Member
Me: "The .45 GAP was an answer to the question nobody asked."
Trooper pal: "Says the guy who thinks .38 Super and 10mm are viable pistol calibers and gets mad when Wal-Mart doesn't have them."