Not one for social pleasantries, the chief of staff would brusquely ask his subordinates anything he wanted, even coffee.
What does it mean?
Not one for social pleasantries, the chief of staff would brusquely ask his subordinates anything he wanted, even coffee.
What does it mean?
"Not one for something" means "he is not the type of person who is inclined to something."
In this particular case, this guy is probably very direct, even brusque; he doesn't care about manners (social pleasantries).
Someone can be
not one for complaining
(He doesn't like to complain)
not one for sentiments
(He doesn't like to be emotional or nostalgic about something)
not one for words
(He doesn't like to talk a lot, or might sometimes struggle expressing what he feels.)