I think the best way to shut up bitcoin haters is to prove that you are earning on bitcoin. When I was starting at bitcoin, there are a lot of negative comments from my friends and they were always telling me to be cautious. Only a few of them supported me and those people are investing on bitcoin as well. They are earning enough money for their needs and they never regret investing on bitcoin even if the price goes up and down.
Me too.. When Iam entering bitcoin I always encountered people who really hate bitcoin. They don't know what iam doing, and the prettiest gift of bitcoin from the people who use it and really trust about it. For the best way to keep shut of their mouth is to see the best profit what you have now, and it's the best prove to make them believe or maybe they're not.