That "guy" is an idiot.
Sniper vs Hunting is a meaningless debate for reasons listed...
Also, I believe that the guy whom compared it to the "assault rifle" smear campaign is spot on.
A sniper is a highly trained marksman who operates alone, in a pair, or with a team to maintain close visual contact with the enemy and engage targets from concealed positions or distances exceeding the detection capabilities of enemy personnel. Wikipedia
Looks like if you replace "enemy" with "deer", this is the definition of deer hunter.