Is this a normal thing in this forum discussion? I have nothing against differences of opinion, but I think there is no need to insult the interlocutor with insults for which there is no clear reason.
It's an open forum and anyone can use any language they want. However, we are civilized people, perhaps the most advance people communicate with each other. Advance in the sense that we are bitcoin enthusiasts. We understand the economy and can somehow predict that crypto is the future of all currency system. But majority people in the world do not even know that cryptocurrency exists. Those who know, from them majority still do not have anything in crypto. So, don't get offended when anyone try to make you down. I don't say it's the correct use but there are few things you can follow.
Ignore the person, try to communicate as low as you can.
Grow a better skin. No one knows you in person. Who cares what and who speaks something about you. No matter it's in your favour or not.
A respect between each other's does not do anything wrong by the way.