A mean act.
The condition, or quality, of being mean (any of its definitions)
Ill will or hatred toward another, accompanied with the desire to unjustifiably irritate, annoy, or thwart; a want to disturb or put out another; mild malice
To treat maliciously; to try to hurt or thwart.
To fill with spite; to offend; to vex.
Notwithstanding; despite.