Classic “get over it” condescension. Some people are unable to control their strong physiological reaction to in-person judgement. Go tell professional orchestra players who rely on propranolol to control their stage fright to just grow up and start becoming a “proper functioning adult.”
https://onlinelibrary.wiley.com/doi/10.1002/hast.70031
https://www.thecrimson.com/column/a-night-at-the-symphony/ar...