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Some people have been brainwashed, and they don’t even know they can lose money after investing in bitcoin. They have the belief that if they invest their money in bitcoin immediately, they will be in profit, so whenever they invest and they notice there money is reducing, they will start tagging bitcoin as scam and they will blame the person that introduced them to bitcoin and might also tag the person as a scammer.
Losing money just because they sold it, if they didn't sell when the price dropped then there would be no loss.
And about being brainwashed maybe they don't know any risks that will occur in Bitcoin investment.
They really have to learn fully in order not to lose money on Bitcoin easily. Just need to hold and profits will come.
Some people start to dislike Bitcoin because they have been harmed by Bitcoin, of course, it becomes a negative view of Bitcoin because of the lack of education on how to invest well and what the risks are.
Bitcoin has great potential to grow after a bear market like today, and when that time comes then those who say that bitcoin is a fraudulent investment or something like that will understand that they don't have any knowledge about Bitcoin.