Align Technology Practice Optimization Specialist interview questions

Worst interview experience of my life. I applied for the Practice Optimization Specialist at Align Technology Singapore and a couple days later, I had a call with the Talent Acquisition Specialist. The call went well and she said she will move me on to the next stage to meet the Hiring Manager the following week to interview with a French lady who is the Business Opt Manager for APAC, who turned out to be the nastiest interviewer I have ever had. She rescheduled the interview extremely last minute THREE TIMES with NO APOLOGY. She conducted the interview online in her pajamas. She came unprepared and went through my resume on the spot during the interview, and was constantly trying to make me feel incompetent for the role. WHY DID YOU CHOOSE ME THEN? STOP WASTING CANDIDATES TIME!! She was rude, condescending, and didn't seem to like me from the start. She asked me to do an impromptu presentation which is also NOT FAIR. I was clearly qualified for the position but she kept trying to find faults in me, and I think there was a lot of blatant discrimination from the start of the interview. She was so, so, so nasty and just the thought of that interview makes me feel uncomfortable. I will never recommend this company because of her. Also asked me extremely invasive questions that she shouldn't be asking during an interview. Didn't even have the decency to follow-up on my application status.