Ragging

But she was openly nice to me after that day under the trailer, and her acceptance of me (probably combined with her father's position in the military hierarchy) led to a gradual end to the raggings I received […]

Source: wiktionary

“ragging” means any disorderly conduct, whether by words spoken or written or by an act which has the effect of teasing, treating or handling with rudeness any other student indulging in rowdy or indisciplined activities which causes or is likely to cause annoyance, hardship or psychological harm or to raise fear or apprehension thereof in a fresher or a Junior student or asking the student to do any act or perform something which such student will not do in the ordinary course and which has the effect of causing or generating a sense of shame or embarrassment or adversely affect the physique or psyche of a fresher or a Junior student;

Source: wiktionary