it's true, many good ideas have been ridiculed by simple minds. however, you never hear about "I had a dumb idea, people laughed at it, and then it went nowhere", and that has (probably) happened far more than the ridicule of world-changing ideas ...
so while it is probably useful to your ego and mental health to respond to negative criticism with "they just don't understand", you should probably be prepared to accept that your idea is just not that good ...