For little boys are rancorous
When robbed of any myth,
And spiteful and cantankerous
To all their kin and kith.
But little girls can draw conclusions
And profit from their lost illusions.

Phyllis McGinley (1905-1978) American author, poet

“What Every Woman Knows,” Times Three (1960)
    (Source)

On when kids figure out that Santa Claus is not real.