"All bastards are bastards, but some bastards is bastards!" A common humorous australian expression. To understand it, understand that in australia, the casual use of the word bastard is just an informal way to say person, but to explicitly label someone a bastard, rather than merely refer to them as such, is far more offensive than calling them a cunt. The other meaning of bastard is that someone is cunning. You could say "All people are cunning, but some are cunts!", but upon reading it, you'll understand why we invented a far more beautiful way of saying it.