Mikeyfell said:
Every time I see "C word" I die a little inside.
because dick and dickhead are perfectly acceptable and they are exactly the same thing.
The extent of the hateful things you're allowed to say about women is held down by a Glass Ceiling. A Glass Ceiling that we'll have to break through if we ever want to see any true gender equality!
Why doesn't the burden of proof ever lie with the audience (Not necessarily to "get the joke" but) to at least differentiate between a joke and a statement made with real malice.
Apologizing for a joke also caries the unfortunate implication of suggesting there was something there worth apologizing for.
That's because you're an idiot

Dickhead and dick are first of all not very powerful curse words. Hell, judging from a lot of the Manly Online Brigade of Ha Ha I'm Anonymous it's a god damned compliment.
**** however, isn't. It's just making the connection that the person is a sexual organ that's to be filled by manly cock, so it calms down.(Origin of the word hysteria could be useful for you here.)
Also: It's a 9-year old?! How much of an inbred douchebag, drugged up "bro" do you need to be to not see the flaw in bullying someone that hasn't matured mentally yet?