SanDisk Senior Software Engineer interview questions

I have attended 1 telephonic round and after that they invited for face-face round. The interviewer asked easy questions and I have answered all. Few questions are very stupid like write a class diagram for product i am currently working on !!which is server side product with millions line of code. After 1 hour of discussion they made me wait for 1 hour and asked me to leave after that. Very unprofessional behaviour from interviewer. Interviewer also have little knowledge on other domains and thinks his world is the real world.

Very unprofessional. First of all they made me wait for 1 and half hours after I reached the office on time. Secondly, in the first face to face round, the interviewer didn't even introduce himself and he didn't even care who I was. He just asked a coding question and threw a pen and some sheets. He didn't care about the thought process, he just wanted final round. His attitude and poker face further demotivated me and this was very unprofessional. The second face to face round was similar to first one. No introduction, nothing. Straight coding questions. I think the panel is forced to take interview on weekend so they all were frustrated and showing that on us candidates. Very demotivating and unprofessional. Nevertheless, I answered everything properly and was expecting that I'd go through. But no they told me that I'm not suitable. No feedback and very un-polite and unprofessional.