It is easy for us Alumni, particularly ones who graduated during the previous millennium, to offer advice similar to "suck it up buttercup" but I personally find this very instructive as a learning opportunity both in leadership and some of the challenges you will face post-graduation.
I personally have had success bringing issues to the attention of poor leaders by being passive aggressive and phrasing things in the form of a question. "Sir/Ma'am, I was trying to find this in the manual so I wouldn't have to ask you so many questions but I can't find it. Can you show me where it is?". "I was looking for the ISM procedure so I could help with training the staff but I couldn't find it. Can you provide me a copy so I can assist you". "The regulations I read say we are suppossed to have study hours right now, I couldn't find the section that says cleaning stations supersede that. Can you show me that section."
I saw a thread on gCaptain that referenced an email with "plebe rules". I personally found the listed rules very similar, borderline exactly the same, as those I lived through during the said previous millennium. However, there can be a huge difference between the letter of the rule and the application of the rule.
For an example, an hour and a half long cleaning party does not strike me as excessive but an hour and half long cleaning party every day is. Missing meals is definitely no bueno and anything without proper PPE should definitely be all stop. In the industry there is a thing called "stop work authority" which means someone can stop the work to address any safety issues. Industry says that everyone has stop work authority but it is frequently questioned if that is true or just lip service. What will they do at KP if you tried to exercise stop work authority? I would certainly be curious how they would respond if you took the opportunity to stand up and speak up for you and your peers even if not popular with your superiors, especially using industry terms. I know that choice is difficult and it seems impossible sitting where you are but it can be effective.
In my sailing days I had several times tried to order a safety harness for going aloft only to be refused. One night the Master told me to go up the mast in the dark and rain to change a Navigation light. I told him no, that in no circumstance would I do that without a safety harness. He questioned my manhood but I stood firm. He ended up doing it and grumbled the whole time but we got that safety harness in our next delivery.
Also keep in mind that MIDN officers should not to be considered as experts in leadership. MIDN officer billets are leadership laboratories where they have the opportunity to learn from their mistakes. There will be plenty of mistakes at KP and from what I have seen in my career, plenty of mistakes AFTER KP too.
Remember ... ACTA NON VERBA