Sorry, forgot the language barrier.
They say that eskimos have thousands of names for snow, the British have millions that can be used as insults.
Bodily parts can be used as insults and tit is one of the milder ones. Given the nature of the bodily part its can even be regarded as an affectionate insult.
British insults range from "affectionate greeting" to genuine full-blooded "I'd like to do unto you what God did unto the Sodomites"!
People's names can also be used in a derogatory sense. For example the phrase "doing a Mandy" refers to a scam in the property trade that was carried out by one of our politicians (Peter Mandleson) where you sell a £300,000 house for £250,000 (thereby falling into a lower tax threshold) but charge £50,000 for fixtures and fittings.
In fact the British have turned insulting people into such an art form that the mere sending of a Christmas card can be deemed to be a gross insult (according to one of our more useless politicians).
If you have ever read "The Hitchhikers Guide to the Galaxy" there is a character in it who had immortality thrust upon him. Unable to cope with the shock of finding himself imortal he decided to devote his time to insulting each an every being in the universe personally. I'd like to think of him as British.
He was not wholly unware of the potential lack of insignificance.