This is funny. Do you really care about the price right after buying? Bitcoin swings by 5% and it's completely normal. There's no manipulation here, just traders and bots doing their thing.

If you buy and the price goes down a smart thing would be not to react at all. What matters is whether after that move down it will continue to go down, or maybe bounce back. These bounces are often misinterpreted by people. They get scared watching the slide down and when it goes back up to their entry point they exit the market so they have nothing to worry about. They are so traumatized by the feeling of a unrealized loss that they'd rather be out with no gain than see it again.