Meta Software Engineer interview questions

I had one interview and got a reject after that. It was a 45 minute phone interview. After introductions, I was asked two programming questions. The interviewer was helpful. I could solve both questions before the interview ended. I asked for feedback, but no reason was given, just a generic email.

I had one coding phone interview, I was invited for an on-site interview at Palo Alto. The process was quite fast. On site interview was 4 sessions: 2 coding, 1 system design, 1 behavioral and research experience (in happened in this order with a lunch break in the middle). Onsite interviews happened in a tiny 2 square meter room. The room temperature was unadjustable, and it got too hot and stuffy inside. It was almost like a torture room. On my 1st coding interview, while I was writing code on the board, the interviewer sat at the table and played with his phone most of the interview. I was thinking out load and explaining what am I doing but he was not listening to me at all. When I asked a question he responded "Huh?". He was rude and did not have any manners. 2nd coding interviewer was much nicer, stood up with me the whole time while I was coding on the board and followed what I was doing and helped me along. This is how it should be... 3rd interviewer came to the interview 5-10 minutes late in a hurry, and was too arrogant. Close to end of the system design interview, he asked me question, I answered but he did not seem to be satisfied with my answer. Then he said "You could do X, but anyway we do not have time left.", X is a technical term with I did not think about. 2 interviewers were East Asians, 1 of them was South Asian and 1 of them was an Asian-American. It felt like I am in Asia. Also, definitely do not dress up for this interview, jeans is more than enough. One of my interviewer was wearing lousy sweatpants and a t-shirt.