baiting, hassling, hazing, needling, riding, taunting, teasing

deriding, gibing(or jibing), jeering, mocking, ridiculingannoying, bothering, bugging, burning (up), chafing, fretting, frosting, galling, getting, gnawing (at), grating, griping, hacking (off), hagriding, irking, irritating, itching, nagging, narking(British), nettling, peeving, pestering, piquing, putting out, rasping, riling, ruffling, spiting, troubling, vexingaggravating, exasperating, goading, testing, tryingaggrieving, agitating, bedeviling, beleaguering, discomforting, disturbing, perturbingbadgering, dogging, houndingbrowbeating, bullying, hectoringharassing, harrying, persecuting, plaguing, terrorizing, tormenting, torturing

making game of, picking on