Even with the wage these jobs garner, the perception is still there. When you tell people you do blue collar work, automatically you think of people drenched in sweat doing back breaking work, with grease on their shirt, dusty steel toed boots and a sense of exhaustion. They come off as low brow crass individual who wants to get paid and head on home when in actuality that is the furthest from the truth. People judge other people in numerous ways but the moment you deviate from the norm, you examined like a microscope and then placed in a category.
It is just the way we are wired.