I think the negativity (particularly in the tech community) is from the notion that we don't totally know why its value is so huge yet high. I watched bitcoin going from dollars to the first $300 spike and thought "wow, that's peak". I stopped watching it then heard it hit like $4,000. Now I'm being told its peaked $10k but has developed issues with transaction times and fees.... I thought it was a currency and now the community seems to decide what its value is based on the phase of the moon (at least in the communities I hear about it; I don't go out of my way).

It confuses a lot of tech people that it has something of value to it that we don't totally understand and we keep thinking that it'll crash or the bubble we're all certain we're seeing will pop.