You could for example DPO based on another LLM's evalution of how a conversation is going, or you could use whether the conversation keeps going.
You can update the weights based on a single point of data (response was bad) but you probably can't usefully update a model that way.
The brain is trapped in the body, and forced to meet its needs (e.g. regulate hormone levels).
The brain and body are trapped in civilization, and forced to produce "outputs" it considers acceptable.
All three, in turn, are trapped in natural selection.
If you would isolate a child in front of a CCTV screen, it also wouldn't magically learn from the images what's our definition of a tree, a bush, a bike, a motorcycle, a car. Someone would have to take it aside and explain it first.
In AI you just don't take it aside, you build a new child.
Supervised learning is "Hello lil CCTV model. Here's a bucket of some 'world' data, labeled in a way for you to ingest. Here, some images of T-R-E-E-S...".