The only idiots that repeat this, are unskilled workers who have no idea what skilled workers do. Just assume they sit in a cubicle and browse Facebook all day for big money.
As others have said, your job is unskilled if you don't need to be trained for many years to do it. A retail worker, in any position, can be trained very easily. Go from McDonald's to Starbucks to Target. Same shit, different company. But from working the till at McDonald's to being a neurosurgeon? Just a surgeon? A doctor of any kind? Yeah, no. That takes training and skill.