this is a trait on the Big Five personality scale that psychologists use.

bit of a judgmental way of describing someone who wants to reduce conflict and get along with others. the opposite would be disagreeable, blunt or inflexible.

yes, you always know where you've got a person like that, but they will not work with you and it's always their way or the highway.

they come across as a bit contrarian and flippant to people of the more agreeable type.