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Being interviewed by a supervisor and peers is perfectly reasonable, but having subordinates interview a prospective supervisor—and even having them adopt a condescending attitude—is rather disrespectful.
It feels as though internal business problems have arisen that you cannot handle yourselves, so you invite a group of industry professionals for interviews and, in the process, get them to provide solutions free of charge.
After all, you are a startup. When asked whether the company has started making money or reached break-even, you do not receive a straightforward answer.