what does "unprofessional" mean?

Another really interesting thing about professionalism is how if you turn up at a shit job suited and booted, keep your conversation strictly to work-related matters, show yourself as eager to fit in with the expected standards, etc, you will become a figure of hate/ridicule for everyone else who works there. Including the managerial caste who are pushing professionalism - so in a sense, it's not about the standards themselves exactly, so much as about having to have a super-keen sense of when and when not to fit those standards

Which personally I find nearly impossible - oh for it to be so simple as turn up looking smart and focus on the job