At some point every entrepreneur feels this way about investors and other folks who say no.  


This is going to happen, and how the entrepreneur feels about this and how the investor reacts are part of the kabuki dance between the two.  


Being right has less of a role to play than understanding what the other person is thinking.  For the entrepreneur, this is a sales pitch, and you are selling your company at this stage.  For the investor, it is understanding how much the entrepreneur can be reactive to conditions.  A single person with the right answer but no way to convey it will fail just as miserably as a widely disseminated wrong answer