>>> there can be an inherent competitiveness in white-boarding interviews. the interviewer can implicitly want to show their superiority over the candidate
This can be present even in non-FAANG interviews. Early in my career, I had an interview at a financial company and for a question about how do you style html pages, my answer was CSS and the interviewer expected something about ASP.NET webstyles. He was't ready to accept my answer saying you are a dotnet dev and should use ASP.NET functionality since it was more superior rather than CSS. I was like CSS is a web standard and anyone even designers can modify CSS.
So yeah, it depends on the maturity of the interviewer.