I've never got laughed at but I've had a lot of people tell me what I should do with my idea. I think the most frustrating part is when someone obviously doesn't understand what you're trying to do and proposes another route that is just bad. I think with any new concept people are very rarely capable of seeing another alternative outside of the way it's always been done. Any laughs I'd just shrug off as just them not understanding.
I did apparently....dunno if it's the environment (Philippines) and my professor (who claims to be a actual "practioner") states that only fools would use my product :D