There are many factors that make many people still say negative things about Bitcoin and even mock it, namely because they do not really understand Bitcoin, ignorance, reject change, have experienced losses due to their own mistakes and also because they were late because they did not believe at that time and after they found out that many people or investors became rich because of Bitcoin they became jealous. And all of that is human nature that has become commonplace.
So, just ignore it because in the end they will definitely get involved because I experienced it myself, there were some of my friends at that time who always denied talking about Bitcoin and after Bitcoin proved its bubble and also saw my significant changes in terms of finances and circumstances they secretly got involved and I am sure those who are still negative about Bitcoin will sooner or later be tempted and get involved and this will continue to exist and become one of the unconscious Bitcoin adoption processes because it is real.
But to bad for them if they don't do anything to educate their selves since they continue to be an ignorant without knowing what they are mocking. There are lots of people regret their past actions that's why to avoid getting into that situation instead of spreading doubts and say negative about Bitcoin they better do research about what's it all about and how they can possible take advantage with it.
Since for sure if they are resourceful they would know that Bitcoin is not bad as what they think but rather it can possibly give them some sort of opportunity that can possibly change their life if they invest and use it on good means.
I just ignore people talk negative about Bitcoin since there's no sense to argue them since if they are close minded our efforts explaining about it will be useless. I'll better focus on myself and happily accumulating Bitcoin rather than wasting my time on negative people.
Change is a constant phenomenon and anyone that's not open to embrace change should go back to the stone age, even the world evolves so I don't know why anyone would be reluctant to flow with it, we're in a digital era and Cryptocurrency is the new trend with Bitcoin at the forefront therefore everyone should embrace it, funny enough one doesn't need much education before they start, just knowing the basics is enough and as time goes they’ll get know much just like we all did, so lack of understanding shouldn't be a major excuse, I think it's just hatred for decentralisation that makes people say negative things about Bitcoin but they can't stop it cause it has come to stay, people have said in the past that it's useless and it won't attain a certain height, bla bla blah but here is Bitcoin, it has crossed $100k and hoping to get pass $200k and beyond in the future.