It's because people are whining bitches, that's the plain and simple truth of it. I quick scope but usually only if someone pops up and scares the shit out of me when I have my sniper out. As far as the skill everyone says it takes goes, it really isn't that difficult. It's all in the timing between the left trigger and the right trigger, I practiced on the acetylene tanks on Afghan lmao. Normally though I'm that sniper with his back against the outside edge of the map creeping around picking off as many headshots hard scoping as I can.
The other day I was creeping when a quick scope try hard kid with a ton of XxX in his name popped around the corner with his intervention, he fired and missed, I proned and pulled out the spas, jumped back up, end of story, the spas doesnt miss. He starts bitching, "You're terrible you have a sniper rifle but you use a shotgun!" I simply replied with, "Its called tactical use of your secondary, if I'm terrible your dead ass must really suck." I don't know if he left right then or after a few more failures but he was gone at the end of the game.