> thus why most consider them to be white collar

You've claimed this twice, but I would guess that almost no one thinks a bank teller is white collar.

Sure they work in an office environment, but their role is more similar to the cleaning crew than to the branch manager.

Nothing about the day-to-day work in terms of autonomy, education, responsibility or any other key intangibles of the job match "white collar". It's akin to being a secretary or a mailman or working in a call center.