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.
To shut up bitcoin haters is to show them your good results or outcome. In the process of managing your investment in bitcoin you will hear lots of negative feedback and comments about it. They try to change your mind of what you believe. As I recommend that you need to do anything to them, just let them talk and everyday they will check on you. Once you have a good result,eventually they will shut off like tjey sont exist.