I'm not sure how you went from plumbers and food service managers to artificial insemination of pigs and toilet scrubbers. Plumbers and managers are considered professional occupations. The later category are hourly employees, which requires no education.

I know some plumbers who make great coin. In many instances better coin than many of my college and professional friends. To say a field, such as plumbing, is a lesser occupation is extremely ignorant on your part. Craftsmen, ie plumbers, carpenters, welders, electricians, can make some great money/career, if they are good at their jobs.

I really do not think you are pompous, as much as you look extremely ignorant on these matters.