Applied at local multicultural resource center for interpreter and assistant

I recently had a frustrating experience during an interview for a full-time interpreter and assistant position at a local multicultural resource center, which is actually at the elementary school where I currently work as a classroom assistant. With my background in theatre and my bilingual skills, I thought I was a strong candidate. However, the interview left me feeling belittled and undervalued. The interviewer, who was different from the person who initially contacted me, laughed at my theatre degree and questioned if I was still pursuing that career. He never even asked about my interpreting certification, which was the focus of the job. When I spoke to him in Spanish, he mocked my Spain accent and made a comment about regionalisms, despite admitting he wasn't bilingual himself. He continued to make dismissive remarks, including laughing at my financial situation when I mentioned I couldn't afford international travel. The entire interview lasted only 10 minutes, and I left feeling like I hadn't been considered at all. Four weeks later, I received a generic rejection email stating they were impressed with my qualifications but decided to go with someone else. It felt like a joke interview rather than a genuine opportunity. I'm left wondering why I even went through the process.