What the fuck? I'd walk and never entertain an offer from a company that spent the interview insulting and provoking me. Who would be stoked to get an offer after an experience like that, much less accept it??
I've worked with people who couldn't handle pressure, who would just shut down and blank out when you criticized their plans or gave negative feedback. It's not pleasant - such people force you to spend more time thinking about their feelings than about technology or strategy. People like that shut down the free exchange of ideas.
I'd much rather suffer through a grueling interview for a day than work with such people on a daily basis. Being a healthy adult without PTSD, I don't get "triggered" by interviewers questioning me or playing games.
I don't know if it's actually useful when interviewing for a job with lives on the line, but I would guess that it creates an effect where the worse the interview experience is the happier you feel when you pass it.