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.
Proving them wrong is the best way to somehow shut the people who hate bitcoin and it could also be way for them to used Bitcoin as they could be influenced by people who earn with the used of Bitcoin. Sometime the best information we could have is the experience of people who used Bitcoin as a form of investment for them to gain profit.