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".
You still see it quite a lot, but yea the environmental argument has been getting a lot more traction recently. I guess it's simply due to the fact that "bitcoin is bad for environment" is a lot easier to grasp for the masses, whereas the scam argument takes a slight bit of brainpower lol.
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.
I'd argue that people not buying bitcoin is actually them somewhat voting with their wallets.