You seem to have confused "The whole AI thing is nonsense. [Anecdote]." with "The whole AI thing is nonsense because [anecdote]." I see a lot of "LLMs are not useful. e.g. the other day I asked it to do X and it was terrible." That is not somebody saying that that one experience definitively proves that LLMs are useless, or saying that you should believe that LLMs are useful based only on that one anecdote. It is people making their posts more interesting than just giving their opinions along with arguments for those opinions.

Obviously their views are based on the sum of all their experience with LLMs. We don't have to say so every time.