pettily

he argued pettily about the color of the curtains.

she complained pettily about the service at the restaurant.

they fought pettily over who would take the last piece of cake.

he tends to act pettily when he doesn't get his way.

she nitpicked pettily during the meeting.

they were being pettily competitive over their grades.

he spoke pettily about his colleague's promotion.

she reacted pettily to the minor criticism.

they laughed pettily at their friend's mistake.

he wrote a pettily worded email to his boss.