Flow Traders C Graduate Software Developer interview questions

Long winded process that requires multiple steps, including a verbal interview with HR, a fast paced intelligence test, a coding challenge (of which the questions are vague at best) with a follow up interview with developers. I reached this stage with relative ease, however the developers I was interviewed by did not seem interested in getting to know me as a person, or asking me much about my solutions and how I came up with them. They instead chose to focus on textbook questions with pedantic answers. They did not appear professional, weren't professionally dressed and appeared to condescend me. I felt severely dejected after this interview and was given no feedback despite promises of HR getting back to me. I feel that if you are going to ask someone in depth questions that you will only find in textbooks, then you should indicate the level of questioning in an interview, as I was told that the interview would be specifically about the coding challenge.