As much as possible, it would really be good that you should really be that keeping it as a secret that you are really that getting involved with Bitcoin or crypto on which it would be better if you do keep it secret and not letting others be knowing that you are dealing with it. Just let them if ever they would really be saying negative things which it would be normal that those people who doesnt have much idea or knowledge about it will really be having those kind of common negativity which it is really just that a normal approach but for those who does have that knowledge will definitely be trying out to defend on what they do know.
I do understand that there are really times that we cant really avoid not to argue specially if they are really saying on something which it isnt true, So this would really be a matter of self control
and if ever you have said it that you are engaging with bitcoin then there's no turning back but if your uncle is the only one who do heard it out then it is really just that fine. He could tell all the things
that he want but we know all about the truth about Bitcoin in the first place.