Isn't white vs blue collar a latent variable? You have to operationalize it somehow. If you just ask "how blue collar are you?", people's answers will be influenced by all kinds of subjective biases.
I'd argue sitter vs stander distinction also makes this presentation more visceral, memorable and understandable. Collar color would feel unnecessarily abstract and boring.
Ha - my dad, a plumber, couldn't fathom that people would shower in the morning and not of a night. Which, when you spend your day covered in dirt and excrement, makes a ton of sense.
(Despite being solidly white collar, I still shower of a night)
Some cultures, it's normal to shower at night, others in the morning.
The majority of Americans I know shower in the morning. Japanese bath/shower at night as a general rule. A western person I know married to a Japanese person said their partner thought they were gross to climb into bed all dirty (not bathing at night). My friend thought "waking up sticky from sleep and staying sticky all day is gross". My friend's solution was to bath both in the morning and at night. Their partner still only baths at night.
I do both. If I don’t shower in the morning, my pits and other parts smell in ways that will make my clothes smellier faster even with deodorant. And going to bed with a whole day of sweat and body oils on you makes your bedding gross faster (it’s there, even if you weren’t active). I can’t really imagine skipping either aside from occasionally, all my stuff would smell and I’d have to run like 50% more loads of laundry.
I'd argue sitter vs stander distinction also makes this presentation more visceral, memorable and understandable. Collar color would feel unnecessarily abstract and boring.