A certain mentor I know positively bol****s his (or her) "students" for being in any way cheery on the R/T - no "hullo", no "goodbye" and certainly no "good day"!
Apparently this is taught at the college (which I hasten to add I can understand) and "there is no place for being friendly when you're on the job".
How very sad
Must remember that next time I'm on the job (oooer missus!!!)