What would you do when you're talking to someone but then he suddenly talks about his hatred on Bitcoin, what would you react to it?
I've never actually experienced anything like this before, I just want to be prepared when it happened to me.
Maybe one of the possible reasons why is they still don't know yet about bitcoin so you must explain explain lots of necessary information about it. If they really hate bitcoin, then you have nothing else to do, just let them be and be quiet. You will just respect them.