Spiritual narcissism by proxy?
"In a world that has lost touch with its soul, the indigo child is here as a light-bearer, path forger, and paradigm shifter. […] If you're an old soul who feels a strong and profound urge to create change in society, you are likely an indigo child.”
https://lonerwolf.com/indigo-child/
Speaking of possible downsides to the notion of spiritual evolution. That some are "behind" and some "before"... Heard of "Munchausen by proxy"? A mental illness that involves, for example, a parent, fully or semi-consciously, making their child sick, in order to gain the attention and pity of those around them or the care provider. It is very unusual. (Learned the other night, from Dr. Phil, that there is simple "Munchausen" as well. Of course. Only that you never hear about it. That is, the same thing but that the person does not use someone else to stage their misery.)
"Indigo children", "Star children", "Crystal children"... Something tells me that there is a similar process going on there. But in the other direction, as well. What would you call it then? “Spiritual narcissism by proxy”, perhaps?
At the same time, of course, you can sympathize with the parents who, out of worry, sadness, self-preservation, find comfort in this explanation, that their children are odd, challenging, have difficulty fitting in one way or another, because they simply don't is "of this world". (Plus, who knows, maybe the explanation is correct in some cases too.)