Well, I think "kids" is okay when you're old, like me, and referring to just about anyone 27 and younger. LoL.
But these guys aren't distinguishing difference in age. They're trying to put forth the idea that these young adults can't possibly fathom that apartheid and genocide are bad.
You're not using "kids" as something derogatory.
I hope I said that well enough. I don't always communicate my thoughts well.