Perhaps you're younger? It was, at one time, pretty common to base the rage abuse on the recruit's religion, place of birth or induction, personal items/photos in the locker/wallet, observations on what made the recruit react, records, tests and so on. It was not hidden or subtle. There was a pretty big swing in the training in the 90's, following the Tailhook and other scandals where the physical stuff, constant swearing and humiliation was phased down. There have been a few rounds of this, over the years, usually following pressure from a scandal.
I've also been in basic training, but in the late 1980's. I definitely got the personalized plan. I also got to hear the DI yell about other people's specific details. Who didn't have a father listed, who had a criminal record, who had to fill out details of pre-induction drug use, who almost flunked the ASVAB, who had a GED instead of a high school diploma, what idiot would be a JEE-HOVAS-WITNESS and so on.
And worse. Didn't happen in my stay, but "blanket party beatings" and other hazing for some recruits was sometimes encouraged. My DI was more careful with physical stuff, though he did have this thing where he would drive his stiff hat brim into your eyes, lips, ears, etc. And quite a lot of saliva sprayed in my face whilst being yelled at.