Their logic was if there are two women in a horror movie, the butch one will die and the girl next door will survive. Which is usually true. But they took it a step further and suggested the Vasquez character has to die because she's obviously a lesbian and therefire can't wind up with the male survivor if there is one.
Which is a little shit lordy, really, because never once does the movie imply Vasquez is a rugmuncher. It's like if a female character displays any kind of physical prowess she's automatically gay.