This is maybe best answered by aidge, but I gathered from his post that he was including himself as one of the people being churned out 'green' from the course he went on, and it was that which angered him - that he felt 'green' even though the course made promises of leaving people with a much higher degree of knowledge and practical skill than it, in his opinion, actually did.
Interestingly, my father is a retired electronics engineer, went to college for years, earnt his qualifications, spent years working alongside senior technicians converting theory to practical experience, went solo, was very successful and popular. His business (longest established electronics repair business in the county) is still running now, still successful and still popular. Yet the current man in charge and his engineer are my two brothers. My father taught them everything they know, although they've been on a few fast-track courses for modern equipment, and the rest is self-taught through experience and using their heads. My father doesn't consider them second rate because they didn't do the years in college and years by the side of senior engineers, nor does he consider their abilities to be below his - in fact, they're now more knowledgable than him after many years in the trade and having learnt much of the newer technologies not pervasive when he was still working in the trade. As I said before, it's what you know, not how you learnt it. Of course, if he's peeved that they just walked into an established business without taking the same path as him, and are now making money he could only dream of when he was on poor pay as a learnee, he isn't showing it.
Oh, and the contractors who come to my workplace are nice chaps, we know them quite well. Went the college route, apprenticeships, have every qualification under the sun, NIC registered, the lot. Shame we have to right their work at times, and try and figure which circuits feed what cos they don't bother labelling in disti boards. Even the 5-day-wonders at work look and immediately point out where they haven't complied with regs... Good and bad from both sides of the fence. The real danger, in any trade, is when a person thinks they know it all, because no one's ever that good. If you accept you have lots to learn, then you ask questions, seek advice, and reduce any danger that comes from your lack of experience. Oops, sorry for long post, stupid fast-typing fingers.