According Samson Mow; Some people hate Bitcoin with an intensity that doesn’t make sense. You need to ask yourself why, and what exactly Bitcoin threatens for them to behave in this manner.
I think some people needs to understand that bitcoin is no man's business concerns. After all nobody is using another man's money to invest. Bitcoin could be greater with time, let's leave the hates about bitcoin.
The people, who hate something(not just Bitcoin) actually hate themselves. I'm not expert in psychology, but usually that's the case.
There are people, who don't hate Bitcoin. They just fail to understand it. That's why they think it's a scam and try to warn others by spreading weird theories about how Bitcoin "is the biggest scam in the history of scams".
Some people were Bitcoiners from the start, but they lost their BTC due to a crypto scam or made wrong financial decisions in the crypto markets. This made them bitter towards Bitcoin/crypto, so they start hating on BTC/crypto, just because they lost money due to their own mistakes.