[n] a stubborn person of arbitrary or arrogant opinions [adj] stubbornly insistent on theory without regard for practicality or suitability
dogmatist, informative, instructive
antiblack, armchair authority, authoritarian, authoritative, biased, bigot, bigoted, bullheaded, chauvinist, chauvinistic, colored, conceited, doctrinarian, dogged, dogmatic, dogmatist, dogmatizer, dogmatizing, fanatic, hypothesist, hypothesizer, illibera