3 different interviews with 3 different managers. Followed that with a job shadow to allow me to see a day in the field. Then an offer was made and I moved to the location I interviewed for

Had an HR screening, then I had an interview with 2 Managers which went great, and a final round interview with the Senior District Sales Manager. I emailed the Senior Manager to schedule time for the final round but he liked to act like he was all busy and important, after about an hour of no response I sent him another email asking if he had a time in mind and responded within a minute. The Senior Manager had this inflated sense of worth that apparently he's too high up there to bother responding within an hour to an initial email if it's not convenient for him. Following the final interview, I received the standard rejection email and asked for feedback from the Senior Manager on what I could've done better. Never received a response; like I said before, his inflated sense of worth makes him think it's ok to not answer a basic request.