I don't have much to add about the behavior of Repl.it's CEO, but I find it amusing that he used "demanding" as a pejorative for the intern. "Entitled" or "unreasonable", sure, those characteristics are bad, but my initial reaction is that a "demanding" intern is one that I'd want to hire. In my experience, the worst characteristics of an intern are complacency and lack of initiative, and between a complacent intern and one who's "demanding", I'd choose the latter 10 times out of 10.