Dentons Legal Secretary interview questions

An HR lady called me out of the blue, without scheduling ahead, at 5:00pm on a Saturday yo put me through a phone screen for the position. When I gave an answer she didn't like (I indicated that I had ambition and would like to grow my career- I would assume a common feeling among people applying to larger firms) she won't on a 5 minute rant beginning with the phrase, "let me tell you about law firms". I don't know if she was having a bad day or what, but the last thing I expected was to be given a lecture about the lack of opportunities in my own field for the crime of being interested in ultimately becoming a senior paralegal at the company she does HR for. Extremely condescending and unprofessional.