Why do graduates like to talk with authority about things they know jack about?

I’m skilled in a trade: welding. I was close to AWS certified but stuff happens. I began a laborer, shovel and pick axe. I was with a company that let the new engineers and salesmen get their hands dirty. Actually they were a burden. Me and the rest of the “help” spent a lot of time preventing them from injuring themselves and from heavy equipment. All this one guy talked about was how all the women in town were fat. I had no interest in his love interests. We were on the road so we lived in close proximity. They had manners but in a sick sort of way. Of course they must have pegged some of my behavior as stupid being academically superior. But this was my territory. If I had been more bold I would have emphasized that fact. Labor and gentleman are not mutually exclusive terms