Walmart Senior Software Developer interview questions

I had 4 rounds. 1. Hacker Rank with 2 questions to complete in 90 mins. 2. Manager round asking about design questions 3. Technical round 4. Design round 1. Implement abstract methods in the given interface 2. JMS code 3. How will you design from DB to job scheduling to handle deletion of millions of records? 4. Various Java 8 Stream questions 5.Large URL to tiny URL

1st round iOS and swift basics. - Good Experience 2nd round EM with advanced concepts. - Worst Experience. EM thinks he is all in all, doesn't even know how to ask question, I have given 50+ interviews in different companies including Unicorn Startups, haven't came across such ill-behaved, unmannered and un-professional EM.