Microsoft Senior Software Engineer interview questions

I got call via microsoft HR. She informed there will be 4 rounds of technical interviews all eliminator. Round 1 interview was a mid level graph question. The interviewer was actively involved, understood my logic, approach, challneged my assumeptions, did a dryrun at end, good experience. Round 2 inteviewer was extremely lazy and passive. It was a bad experience. He gave a problem statement of sliding window and disappeared. Wasn't intrested in hearing approach or even reading code. He came after 30 minutes , did a dry run and final output wasn't exactly correct. I identified a logical bug and started correcting it. He said there is no need , just finished the interview after that. The code i had written was optimal code but he didn't care to read that also. And there was still 20 minutes left. It gave me impression that interviewer in not at all interested in taking interview and they have been pushed my management. HR called next day to say i am not selected.