In healthy work environments, the culture is to assume the best about the intentions of others ... sounds like he wasn't doing that at all.
Recruits leave with a sense of pride and belonging, and they fit seamlessly wherever they end up, doing their required work with minimal hassle. They address problems at the lowest possible level (e.g., a supervisor handles the discipline--no need to run it up to management unless the ramifications are severe.)
Notionally, anyway.
Another justification for making parts of basic training hard, is that fighting a war is hard.
So before they send you out into the field, they should make sure they know how you handle sleep deprivation, bad food and confusing orders etc.
This is one of those pieces of advice that is spoken but has a huge unspoken part, mainly - if talking to the boss makes them look bad or causes problems for them more than not talking would then you stay silent.
There are healthy work environments in the military. Basic training, however, is not one of them. There are certain things about joining a military, like the prospect of having to be sent to kill other people you've never met or be killed by them, that changes the calculus of what is "healthy" or not.
I remember in basic there were Drill Sergeants you learned that could be reasoned with and those that could not. Your experience depended largely on which DS was on shift when you screwed up.
It was ridiculous that they punished me for coming forward. OTOH, I knew them well enough by that point, and a wiser me would have chosen to continue keeping a low profile until I could GTFO.