My experience is different, I can't remember the last time I heard someone claim that Bitcoin is a scam or a fad. These days I hear more "bitcoin is bad for environment" and "blockchain technology has some merit, but other coins will replace it soon".
But I think it's not really important what some random people on the Internet or in real life say, because they are not voting with their wallets.
when bitcoin was still not as hype as it is today and achieved a lot of adoption, bitcoin was always said to be a scam even bitcoin was predicted to drop drastically until it was no longer valuable.
But the fact is that currently bitcoin is an expensive asset that is widely discussed and many investors are just starting to enter.
There is still nothing that can replace bitcoin and it has been maintained to this day.
People who say some negative things about things they don't know are certainly showing their ignorance. They will regret saying bitcoin is a scam.