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.
Wow, that is true, if they sees you that you earn money from bitcoin then I think their wrong thoughts will be change. But the thing is just do what you usually do because hates are always there to gossips wrong thoughts, just dont mind them.