LinkedIn Senior Software Engineer interview questions

it was the first round. they asked describe any one project of yours and what did you learn from it. design wise and product wise. with followups like what would you do differently right now

1 phone interview and 4 or 5 (don't remember) onsite interviews. The process was decent overall until the very last interview, the hiring manager seemed a bit condescending and asked me multiple times what the purpose of my Master's degree was (for context I have stellar degrees from a top five US university in CS for both undergrad and grad school). He still passed me in that interview, but seemed very skeptical of my qualifications, I can't imagine why honestly (sexist?). After the onsite, I got a call from the recruiter who said I had good feedback on all but one coding interview which they wanted to redo. When I got to the interview, they had actually set up a system design interview for which I was somewhat unprepared for but still gave it my best shot. I then emailed him and asked him what happened with the scheduling and why it was last minute changed to design, but he didn't bother to respond and simply rejected me. I don't mind being rejected generally but I felt that it was completely unfair that he essentially ghosted me after putting me through 7 different interviews and completely wasting my time. I would never recommend anyone apply or work here just by the sheer disrespect I experienced.