The obvious difference is that AI has abundant use-cases, while Crypto only has tenuous ones.
Maybe there is added negativity considering it is a technology where there is clearly a potential threat to jobs on a personal level (e.g. lift operators were very negative towards automatic lifts).
Crypto is an umbrella term for a number of solutions, including blockchains (roughly 1,000+ as of right now) and cryptocurrencies (roughly 22,000+). While a given blockchain may be limited in terms of how much can be 'mined' or grow, you or I could very easily create a new cryptocurrency or even a new blockchain. Assuming we got traction with it, there would now be N+1 more out there.
Gold is not something we can so easily create. It also has intrinsic value through practical applications.