Online hiring due to COVID 19 and it was a good process and they never tell that we'll inform you and all. They straight away tell if you are selected or not

I interviewed for Senior Security Engineer. My first technical screen was scheduled without checking my availability first. Readers, this is your first red flag. My interviewer was incompetent and had very poor communication skills. He also lacked basic understanding of computer science fundamentals. His questions did not make sense and every time I asked him to clarify he got annoyed. E.g. You have a backend and frontend. Design a system. When I asked him what kind of system it is - ecommerce/social media/tinyURL he looked dumbfounded. He tried to ask me "technical questions" about NodeJS and Typescript but he lacked basic understanding of Javascript and NodeJS. Once he realized his questions are not making sense it was very hard for him to recover after that. 2 programming questions: 1) Determine if string is palindrome or not 2) Remove duplicates from string Regarding (2) when I asked him if my implementation should return a new string he got very annoyed. Behavioral question - what if you need something from your coworker and they dont respond? Reader, another red flag When I asked some questions he looked very puzzled. Overall I got the impression that 1) interviewer is a very bad engineer 2) work culture does not support its employees