Think you'll find that if you just take one moment of thought, instead of acting on default position, that the joke is aimed at the Prime Minister of Canada.
Ironically, a man who is feted and lauded by the left leaning, a man who has often shot himself in the foot, yet all is forgiven.
That you choose to see it as making fun of a 16 year old, probably says more about you.
Now how about this for a serious discussion - when did we stop thinking for ourselves and simply see everything automatically now from our self created entrenchments?