Cunt is an English slang word that refers to the human female genitals. It is considered by some to be one of the most offensive words in the English language. Some reject this exclusively negative connotation as inherently sexist towards women, and claim that insult is an innappropriate use for word which once meant respect for women. In general English usage, the word vagina is considered to be much more polite, though strictly speaking this Latin word refers only to the internal female genitalia, unlike vulva. -Wikipedia.com
That's from Wikipedia. It's sexist. It's like saying "you're a girl can you can't be strong as men you little piece of sh-t, you're such a cunt"