IIRC he said he had expected some kind of alternate hippie-economy based on genuine values and having ownership of the neighborhood, and was disappointed that he didn't see any evidence of that. Just a bunch of idle people.
My uncle had the same description. Disappointed that it was just stoned people and not a lot of real substance.
https://genius.com/The-mothers-of-invention-who-needs-the-pe...
Then there's the fact that even the 18-20yo "Hippie Pilgrim" demo, which has held up pretty well for generations, is secretly stratified by the socioeconomic status of the parents. One's take on it depends on the specific cliques they're exposed to.
FWIW, the parent's comment matches my dad's sentiments about the city in the 60s/70s, but I wouldn't start a bar fight to defend his honor on this point. I would be genuinely curious to hear you elaborate on the changes. I live around the corner from the Upper Haight and it has always been one of my favorite parts of the city, but it has always had a lot of loafers doing nothing but drugs as long as I can remember.
Before the citywide affordability crisis, I think you were more likely to end up outdoors because you hit bottom than the other way around. The outdoor segment and the weed-dealing segment have always been more visible, though.
The community of people that were actually serious about that stuff was as far as I can tell pretty small and exclusive.