Why would you care what others think? I'm sure the people who first used computers/mobile phones/the internet were all mocked at first. With that being said I wouldn't try sell it to people as a guaranteed investment of 'going to the moon'. Most people will probably juust think its a too good to be true scam or something and nothing is guaranteed. Bitcoin could as easily just collapse or become obsolete then you will look silly and those people who mocked you will be pretty smug. Just explain the positives and negatives and make sure theyre aware of the risks. They'll probably respect you more for that.