Although this perception exists among many students, this is not true. Also, at BITS everyone has to sign and submit an affidavit as per the UGC guidelines that he/she won't get involved in such activities. However, the best real-life experience can be described by someone who has studied there.
My cousin who is currently doing his Ph.D. from BITS is about to complete his 7 years on the campus, and here are his experiences regarding ragging.
Overall, you won’t live with a fear or sadness of staying far away from family as you will be welcomed with so much love from the seniors. Even in the current situation, there are no instances of ragging because every student has the right to complain to SWD. Moreover, no one hardly gets time for ragging at BITS Pilani.