It's very fashionable to dislike cryptocurrencies of any kind, which includes bitcoin. This is the most cogent explanation, as most discussion about it is rehashing the same few problems. Even if those problems have solutions or are not actually problems, nobody is convinced. That is why I'm convinced it's primarily emotional.

I think it's because the tech has been adopted as the disguise-du-jour of scammers and charlatans. Once the public understands better and the hype goes away then maybe we will actually be able to have some applications built that utilize the actual advantages of blockchain without dealing with the mental overhead of worrying that it's more than likely a scam.