The whole point in the sound nin vs konoha kids, the sound nins do have level 2 seal, but the konoha kids are from THE best village they are not at the prime of their abilities and therefore the sound nins UNDERESTIMATE their opponent.

1 VERY important point of war is to never underestimate your opponent, i train a little martial arts so no expert, but even a black belt should estimate every opponent to be better than himself and therefore be prepared.

These sound nins doesnt do that, they think that these are just stupid no good kids, well these kids are trained and have had a very rough training.

I find it reasonable, though i think that the new guy in 202 which naruto is gonna fight will be the hardest, since he doesnt underestimate an opponent.