Petuum Senior Software Engineer interview questions

Petuum had reached out to me through LinkedIn and then email. Started with a phone call with recruiter, than a technical call. Then a 3hr onsite. In the beginning the process was smooth and great. However the hiring manager was extremely rude and belittling the moment he walked in the door. Entire interview his demeanor and run down of processes were red flags. Remaining parts were just standard white boarding. Rejected as I couldn't work under a manager who is confident enough to be rude in an interview.