The phrase that ticks me off the most is "fire fast". Like seriously? You spent all this time on hiring the best candidate and now are going to get rid of them fast because they don't pass your smell test? I think many experienced/older people in tech have been burned by this at some point, and it makes them vary of working for startups.
But there are exceptions. I have a friend who is fairly senior ... he quit a cushy corp job for a well funded startup. My friend was working like crazy for some interim deadline .. the CEO saw what he was doing and said "this is a marathon, not a sprint. don't burn yourself out". Now, that is the kind of leader you want in a company. Hire self-motivated and technically competent people and realize that employees are humans. Tech is about speed but as an industry, we are letting quality and humanity slip in favor of speed. And that is wrong and foolish IMHO.