I have a friend who was ridiculed by a founder recently for not understanding the concept of equity. She had rejected his salary + equity offer which was a %50

I have a friend who was ridiculed by a founder recently for not understanding the concept of equity. She had rejected his salary + equity offer which was a %50 salary cut from her current position. Irrespective of what the equity portion was I thought the founder's response was disgusting and pretty much validated her decision to pass.