Sorry to hear about that experience. People can be truly shitty sometimes. I got told I "didn't have enough C# proficiency, and this role is unsuitable for C#

Sorry to hear about that experience. People can be truly shitty sometimes. I got told I "didn't have enough C# proficiency, and this role is unsuitable for C# learners" on a take-home assignment recently. I found that feedback point interesting but vague, so I pushed my luck and quizzed the recruiter further. Apparently the problem was using C# 9 features (pattern matching, record types). I'm not really a cynical person, but I find it amusing I'm apparently incompetent in a language because... I can use the new features? (You could say I over-complicated it, but I really didn't.) In my experience time spent at the beginning of the interview establishing rapport with the interviewers is well spent. Make smalltalk before the interview properly starts. Ask how the interviewers plan on asking questions. Always stay friendly, agreeable and positive. It's far harder to be an asshole to someone you've already been nice to. If they continue to act up, then feel free to end the interview yourself because you don't want to work there.