I think a lot of the hate is a reaction to the baseless hype from people just trying to get rich from cryptocurrency. There are tons of altcoins and ICOs being made and advertised constantly that are nothing but hot air. There are people making a lot of money (or thinking they can) from buying into altcoins (hyped up by nonsense marketing pages), which they then try to shill to others. People are often being incentivized by rising prices to act this way!
Outsiders start to learn that "blockchain" = "get-rich-quick nonsense", and miss the interesting technical discussions (which often come from the Bitcoin and Ethereum spaces).
Outsiders start to learn that "blockchain" = "get-rich-quick nonsense", and miss the interesting technical discussions (which often come from the Bitcoin and Ethereum spaces).