Organ is slang for penis. In this context, crabs are pubic lice.

The joke is saying that while it might be annoying (and weird) to have literal lobsters on your piano, it's worse to have pubic lice.

>Making fun of him, talking about he should be banned, just makes more and more people curious about him.

I'm genuinely curious: when people say this, do they really think it will convince others not to talk about him?

It's the Internet, dude. Don't like hearing about Andrew Taint? Wait five minutes. I'm sure Donald Trump or Elon Musk will do/say something hideous to steal back the limelight soon enough.