This is also what happens in my area, many people say Bitcoin is a scam, because they have experienced losses in altcoins even though these two investments are very different. It's just that they lack literacy about bitcoin which makes them unable to see the advantages of bitcoin. So in essence it's all because they don't have knowledge, if they had knowledge about bitcoin they would realize that bitcoin is a future asset that could even potentially be better than fiat. However, there are also some people who don't like Bitcoin, not because they have experienced losses, but because they don't believe in virtual currency, they prefer to invest in investments that can be seen physically.
There are many reasons why someone might not like bitcoin, although lack of knowledge is probably the biggest reason. There are also some people who oppose bitcoin even though they have complete knowledge about it. Perhaps the reason is because they are jealous because they learned about bitcoin too late and think it is too late to invest, or maybe they can't accept the fact that many people invested in bitcoin and were able to improve the economy so quickly that overtook them...That's why we often see some people giving very silly reasons to hate bitcoin. They like it but they find every way to fight it and prevent people from investing in it.