For those who are saying they can't understand why you'd ban it:
30 years ago (all but) my db got a book out from the library called something like "Book of naughty children". He found it very funny. So funny he started imitating some of them. There was one who gave silly, totally irrelevant answers "what are you doing in the toilet?" "I'm boiling an egg."
And one who if he didn't like the questions would pretend he'd heard a rhyming question. "Look at the billy goat." "I can't see a silly boat".
Funny in the book. Poentially very rude and definitely irritating in real life.
There were others, but I can't remember them.
My db thought it was very funny to do these two. So much so, he did them, and did them. And my dp went from "ignore the silly phase" to desperately trying to stop it, and failing.
I doubt he can remember reading the book. But he still does them, particularly the second. It's actually become a habit he can't stop.
Personally I can't stand HH. He either is treated really badly by his parents, or he gets what he wants through being bad, neither of which I think is healthy for a child to read about. However I haven't banned them, but treat them with indifference, so the dc really aren't bothered by them. Never seen the TV show though.