I think they are totally rubbish who do not like bitcoin as it is one of the most discussed matter. If one has very simple idea, then they should have knowledge about bitcoin.
I think its very easy to convince them about bitcoin because its not about that they hate bitcoin in past there were some other crypto who make people scared with fraud and now its very hard for them to believe on any other crypto but bitcoin is not like other crypto bitcoin is now very stable safe and sound for every one because it can give you a lot of opportunity for earning and Im one of their example here and I must say thanks to bitcoin.