I agree, having been in both camps, office workers seem to think they are better than the shop floor. It's certainly another prejudice that I have experienced a lot.
Right from when I was 16, I did a 4-year apprenticeship and my mate did 2 years as an office trainee same company, he had a staff canteen and staff toilets we had a works canteen and toilets. He wasn't bright enough to get in as an appro but ended up treated better than me.
Just shows not all things were better 50 years ago as we all can go freely to the same canteens and toilets today. toilet apartheid is no longer an issue but I want compo for the mental scarring I received. wow, I was a victim yes!