OMIC USA interview questions

I had an online interview where 2 interview members were laughing throughout entire call. I did not receive any explanation about the reasoning behind the laughter, but it consisted for the entire hour. I was qualified for the job and was providing appropriate responses. Unprofessional and humiliating.

two rounds interview, with HR first then the supervisor in that section. Online interview with HR first and in-person interview with short company tour after passing the second round interview.