Meta Machine Learning Research Scientist interview questions

Approached by the recruiter. The interview was scheduled in two weeks. I had the worst interview experience. Even if i have mentioned to the recruiter that i am comfortable in Python for coding challenge but the interviewer asked me to write in C++. He did not even introduce himself properly and had very poor accent. When i mentioned that i am comfortable with python, immediately he said then port everything (Given class definition and function definition) in python and write the code. I was still confused about the problem and when asked about it, he was still explaining everything from C++ perspective. It took about 20 mins for me to understand what he was expecting. The problem was not that complicated. I was hugely disappointed at the end.