on one's high horse

aloof assuming audacious autocratic biggety boastful bossy bragging cavalier cheeky cocky cold-shoulder conceited contemptuous cool disdainful dismissive domineering egotistic egotistical haughty high-and-mighty high-handed imperious insolent know-it-all lofty lordly narcissistic on an ego trip overbearing overweening peremptory pompous presumptuous pretentious puffed up scornful self-important self-satisfied smug sniffy snippy snobbish snooty snotty stuck-up supercilious superior swaggering uppity vain vainglorious