I think that the GP must not be American.

I noticed in Ireland (at least) the word "cunt" is used to describe an unpleasant/objectionable person in general (regardless of gender) whereas in the US it's a derogatory term for a woman.

There's at least four possible parsings here depending on what was meant by "straight" and "cunt"

In one corner of the matrix is a heterosexual woman and in the other corner is an ill tempered gay man.

Indeed, its a non-gendered term here.