So I asked my friends regarding their opinions and impressions about bitcoin and their answers made me laugh. One of my friends answered:
"Bitcoin? Bitcoin is used for transactions in deepwebs to buy drugs!"

So they think that bitcoin = deepwebs. So they stay away from bitcoin thinking it was illegal
Another one:
"Its just a waste of time. You will not earn from it"

And when you give him proof that bitcoin is valuable they'll be like "omg teach me how!!" Lol
And lastly,
"Bitcoin? Bitcoin is a scam"

So yea they think bitcoin is fraud and a scam.
It's so funny to think that people who don't have knowledge about bitcoin automatically thinks that bitcoin is a scam because of the issues regarding bitcoin scamming. So yeah.
Most of the people lack of knowledge about bitcoin and of course they will judge it by their own but it's common because most of the type of people nowadays is so judgemental even though they don't know the origin of the thing and it must be your friends.
My biggest and real advice for yeah convince them to use bitcoin too because as you said you've earn from it so when you're really a friend of them you want them to be in good hands even though they're not believing on it try to show them some improvements about your money or some of your stuffs and I'm sure they will try it too but the choice is on them let be on what they want.