Weird meth head interviewer

It was just 1 person because the tech lead couldn’t be there. They asked me a standard LC question. They kept interrupting me when I tried to explain my reasoning and just told me I was wrong and it should be like X Y Z. They asked me the time complexity to access an element in a set. I told them O(1) average/expected time complexity and O(n) worst case. They told me I was wrong because I had an array and I need to check each element, I told them my set uses a hash function to map elements, without letting me finish they said I needed to use a map. They’d also keep talking while asking multiple different questions without letting me answer the questions. Like what do you do when you have a dumbass interviewer like this. I just went with whatever they said with little pushback.