Where public transport differs from other industries is that the workers (booking clerks, platform and gateline staff, conductors &c) in it can be easily viewed by the general public, enabling them to make judgemental remarks not always with relevant facts available.
I was a booking clerk in the 1960s (having decided that computer programming for a bank, whilst well paid, was mind-numbingly boring and un-fulfilling). The station I worked at had recently been re-built, and the booking office was the size of a garden shed, glazed all round above waist height, in the middle of the concourse. On a busy Saturday morning shift I would sell well over 1,000 tickets (the town then had a population of about 120,000) and also deal with telephone enquiries, and strike a balance on tickets vs cash sold at the end of my shift - but with the window still open. Shifts were straight through 8 hours, no such thing as a PNB.
All of this was done in full view of passengers, who sometimes stood at the rear, seemingly watching me through the glass. The opportunity was taken to express opinions about my priorities; making observations about time spent on the phone, or, when seeing me filling in the account book. Hmm, 1377 minus 1292, that's 85 tickets at £1/7/9d equals £---, try doing that in your head (no calculator) with someone hammering on the window and the phone ringing, and someone looking through the window to see what you're writing.
I sometimes wondered what were the working practices of the people ready to jump to conclusions about mine; but, for most, their work was carried out without their customers benefitting from the ability to view their working practices and conduct.
But things never change; even on here, in the current regime, negative comments are made about the diligence of conductors, booking clerks and gateline staff, based apparently on casual observation.
In response to an allegation up thread; Certainly, I had no time to read a newspaper - not that I had the wish to; I have never smoked, but most of the male passengers did, sometimes blowing smoke through the small aperture in the glass; and lager was a drink for ladies, served in an ornate half pint glass. However, I would make a wild guess that workers in other industries may have done some of the foregoing, safe in the knowledge that their customers could never know.