The child is little and doesn't know any better; why should we grown-ups stoop to his level?
Tips
usage
Almost always 跟 or 和 + someone + 一般见识, negated or in a rhetorical question: 我不跟你一般见识 "I won't lower myself to your level". 一般 means "the same" here, so arguing back would mean having the same poor judgment as the other person.
