Why would people have an issue with hardscoping? That's how they are meant to be used. From range, looking through the scope.
Quickscoping is purely abusing the game mechanics to use a gun in a role that it was not intended for. Quickscopers need to die in a fire. Not really, but they piss me off.
In the end, people just hate one shot kill weapons. There is no way to tell from the receiving end whether the user is actually skilled, or just lucky.