Joining these forums can serve as something of a reality check to gifted young people; they may be used to most any half-baked thought still being sufficient to impress their environment. Rarely is polish needed, rarely are "proofs" thoroughly nitpicked. Getting actual feedback knocking them off of their pedestal ("the smartest one around") can be ego-bruising, since we usually define ourselves through our perceived strengths. Ego-bruising, yet really, really important for actual personal and intellectual growth.

Blessed be the ones growing up around other minds who call them out on their mistakes, intellects against which they can grow their potential.

(I don't mean this as applying specifically to Avi, but more as a general observation.)