The bit coin just became an issue. Those who dislike bitcoin may not know exactly what they are or may be judging personally. That's why I can not imagine what you can say.
Exactly it does happen most of the time because of lack information and less knowledge about something related to the bitcoin, it can be the reason why they dont like bitcoin so I think they need te proper guideline and good information about bitcoin and the process of getting in the bitcoin currency so it will change their thinking and they will not be afraid of lose while investing in bitcoin.