Acumen Technical Writer interview questions

They compensated me for my travel, which was generous and polite. I had to take an exam about grammar and research. Then I remained in one room all day while different department members spent 30 minutes each asking me the same exact typical interview questions all day, one at a time. It was exhausting and redundant. One interviewer even said out loud that he didn't understand why he was interviewing me, which was awkward. I think the weirdest part was that my interview and test with them was scheduled from 10am-3pm. Around I think 12:30 or 1pm, the HR rep told me I wasn't going to get a lunch break. She told me I could remain in the interview room by myself and either have a protein bar OR a bag of chips. I thought it was ridiculous. I would have liked to have been informed that I was responsible for my own lunch ahead of time so I could've pack a sandwich. I ended up walking to the cafe on the first floor and buying myself a proper lunch, but HR was bizarre about it. She told me several times to make sure I wasn't late for the next interview and then awkwardly told me that if I had been traveling from further away, an employee would've taken me out to lunch, but since I was close by, they wouldn't pay for my lunch. It was just....bizarre and borderline rude. No matter where you travel from to attend an interview with a company, lunch is lunch. Everyone deserves to eat more than a bag of chips for lunch. And I felt it was a bit dishonest and just unprofessional that the company didn't tell me ahead of time that I had to figure out my own lunch. I wanted the job, but after the interview I realized the company wasn't very organized and I didn't understand the logic behind the interview. The whole thing was a red flag.