My god... you're so entitled in your ignorance. I don't know why I'm even replying.
1- Do you understand that you can say the same thing in a polite way or with a completely disrespectful tone? Most of our communication is non-verbal. You're judging a situation, and you're completely sure about it without even watching a video.
2- You assume we rejected him only because of that, I never said how the rest of the interview went.
3- Using the word "toxic" so many times just tells me what the problem is, you are the kind of entitled person who thinks bad manners should be tolerated.
4- Stop with the god complex, senior engineers are not special kinds of people, we need to be filtered too.