Jebsen & Jessen Service Administrator interview questions

I received a message from HR and I was told to have a face to face interview at the office. I met with the GM and HOD of the admin department. The whole interview process was unprofessional, and the attitude from the GM was unbearable. The GM kept on targeting my part-time work experience as if it was a bad thing, with comments like: "Why are you still working as a part-timer and not as a full-timer?" and "You know we don't count part-time work as experiences right? Normally part-timers are only there to do a single job." (Well what would you have me do instead? Just stay at home and do nothing while I look for Full-Time work?) If you're going to be so unprofessional, then why even bother having me come down in the first place? This was a waste of everybody's time.