Because according to him Bitcoin is a small number of people who have a lot of Bitcoin. They can easily go down on the bitcoin market if they want to.
Example: Cz. Craig wright & Michel Sailor etc.
Looking forward to the well thought out opinion of the experienced in this regard.
It doesn't matter if your friend doesn't want to buy and hold bitcoin because that's his choice. I don't think the price of bitcoin will be affected by whether your friends buy bitcoin or not
In my opinion, lowering the price of bitcoin by selling bitcoin en masse is difficult. No one wants to sell bitcoin en masse if it has the potential for higher prices in the future. Apart from that, if they sell bitcoin en masse then just wait until the price of bitcoin goes up again because the number of bitcoins is limited and many people want to own bitcoins.