I find your definition of "insulting" really confusing, as pretty much all "white collar jobs" are "I sit on my butt all day and think lazily about things with very little pressure" jobs. They push paper and write reports on things, maybe doing some annoying math at times, but the entire concept of a "high pressure" job with "consequences for error" seems entirely at odds with white collar, and I'd personally have expected people who actually do something important on a daily basis (unlike, for example, me) might would find being categorized as "white collar" insulting?