An interviewer imitated my stutter and said not to speak like that in the next round with the upper management

An interviewer imitated my stutter and said not to speak like that in the next round with the upper management I was interviewing recently and the the interviewer imitated my stutter and said not to speak in front of upper management like that it will not be a good look for me. I was appalled and also disappointed the interviewer was way older than me and I certainly didn’t expect this from him.