Sisterson & Co interview questions

The interviewer was a partner and was very unprofessional. She thought I was interviewing for an internship when I specified that I was interviewing for a full time staff position. She seemed taken aback and very skeptical at the fact that I was planning to work and finish my masters degree at the same time. I received a rejection letter in the mail a week later. Why they didn’t send me an email instead of a physical letter, I’ll never know.