Internet Brands Senior Java Developer interview questions

It was just one round of interview with one Java engineer. He just asked one Algorithm question which I solved in one way. He kept asking me to optimize which I was able to do. But he kept looking for an answer that was in his mind. Which I was able to answer partially. But not exactly what he was looking for. I felt like it was very inappropriate to ask a candidate question which is not his core skill sets and also the questions which are not relevant to the Job Title and Description. Not every company is Google. I can also ask 5 other algorithm question which he would not be able to solve as well. This is not acceptable.