Youth black belts are meaningless. You mean to tell me that some 10 yr old 2nd dan is actually able to use the techniques properly against a 30 yr old, 225 lb aggressive? Please. Unless the kids gone through the Spartan military training, 1 backhand from the adult no belt will send your 2nd dan flying and crying. Just because he graduated 1st grade, doesn't mean he can hang with the high schoolers. 99% of kids programs are watered down, scaled back and simplified, because 99% of kids out there don't have the physical attributes, the mental ability or the attention span to hack it. Thinking that your 3rd dan rug rat is comparable to some adult who's worked longer than yours has ben aware of their own boogers is an insult to every adult who has bleed, sweat and worked through pain to achieve a real belt.
But, we know how kids programs go. You pay for this, and you pay for that, and you pay even more for some special high intensity training, and that is exactly what you get. Lots of it and a lighter wallet for a glorified gym and baby sitting session.
But if you really think your kid's all that because you bought him a belt, let him spar with the big kids. Let him hang with the grown ups. Any legit dan should be able to do it, regardless of system. Too mean? Then stop living in your fantasy world and giving your kid a false sense of security before you get him hurt.