LinkedIn interview questions

There were multiple video conference rounds and then there was 1 face to face interview with 2 hiring managers. What stuck with me through the interview process was how nice everybody was. But at the end of it, when I was rejected (I'm assuming because I never heard back from recruiter) was when I saw the true colors. Horribly unprofessional because they didn't even have the courtesy to get back to me that I'm not selected for further rounds. Truly a shameful HR and hiring team who think too highly of themselves!