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Somebody explain the 'children to gaslight' line?
Gandalf really had a thing for Hobbits, who look and act somewhat like children, though they're significantly older their their human counterparts.
How do they look and act even somewhat like children? That's a bad take
They're small, can't grow bears (usually). They're also generally somewhat playful and shy. They generally fear things they don't know, which can be seen by the fact they don't travel far beyond their homes. They are pretty care-free and not bothered by external event, and fairly joyful. They live relatively simple lives and generally seem to be easily amused.
They don't behave exactly like children, but they do have qualities we associate with children. That, plus their physical characteristics, I'd say childlike is a decent description, particularly if you're just trying to insult someone for hanging around them.
I interpreted this as Sans thinking the sorcerer is Dumbledore, who did indeed manipulated children for his own goals, but it turns out it's Gandalf, so it's a little bonus joke.