Have I said something too harsh? He took this personal and report me to my eldest brother, my brother said I shouldn't mind, he doesn't know that my brother is now also a Bitcoin investor, my mistake was making it public, which my brother never did.
The tone of your answer is somehow disrespectful. You can just keep quiet and pretend to listen and do what you wanted to do. Instead you flared out and answer your uncle disrespectfully when your uncle just wanting to extend his concern to you. He has a point, Bitcoin may or may not fail one day, if you put all your resources in Bitcoin and it fail one day then you will be in trouble. Looking for another form of income is always better than having one.
If you are still planning to get into Bitcoin, don't post anything about it in family group chat or on your WhatsApp status, this was my biggest mistake.
You hate your uncle for advising you what to do and yet you are here telling us what we need to do. You hate someone giving you advice and yet you are here giving others advice isn't it ironic?