Blue Collar and White Collar are archaic terms from the beginning of the industrial age. Often they served to differentiate labor and management, as in who can be unionized. Other stereotypes evolved as well, but most jobs today cannot be clearly defined as blue or white collar, so its ridiculous to try to pidgeonhole them into one of these categories.

My personal observation is that when technical workers are required to wear a dress shirt, more often than not it's striped. So, shouldn't programmers be Striped Collar Workers?