He can dump it and I will buy some.
CW lies but in the end I doesen't really matter.

For Bitcoin it's doesen't change anything. Dumps happened and they will happen in the future but that doesen't matter for the Bitcoin because it doesen't affect it in any destructive way.
There are whales in the market who can manipulate the price but they are in stock market and everywhere so nothing spectacular. I sleep well as a Bitcoin investor and often I don't even check the price or what is happening in the market. Similar like with gold.
On the other hand stocks, altcoins and smaller projects that depend on certain group action, can easily be manipulated in destructive way.