It was definitely common and acceptable for the machinists, techs, engineers and manager to say that they would rather be doing something else than working or that they would rather have a job more glamorous than working with machines and pieces of steel. In other words, back then, you had to do your job or risk getting fired, but AFAICT there was no risk to admitting that you didn't like doing your job. In fact, if you went around telling people you really liked your job, my guess is you probably would've been viewed as at least slightly socially inept for being unwilling to engage in the small rituals that lubricated social interactions -- or more precisely for getting one of the common rituals backwards.

This was at a large machine-tool manufacturer in Massachusetts. In something I read or heard IIIRC, this manufacturer was referred to as the IBM of machine tools. The owner of a motorcycle store (which employed many motorcycle mechanics) revealed in conversation with me that he considered being a machinist at this employer to be a particularly good job.

In contrast, does anyone reading this doubt that nowadays if a programmer in Silicon Valley tells his boss that he/she doesn't like his job or doesn't like working as a programmer, he/she risks getting fired unless he/she knows his/her boss at least reasonably well?