OK, I don't even know the dude, but it's obvious to me that the guy was attempting to make a crude joke that failed, not intentionally being sexist or demoralize women or whatever it's trying to be turned into.
The Halo community is filled with a bunch of children who say "rape" in association with kill whenever they're on fire in the game, so to speak. I.e., comments such as "you just got raped! killtacular!". Yes, crude and stupid, but it's clearly not meant in a sexual or intentionally demoralizing way. It's just your typical, stupid online slang.
The woman has an awesome name, Kiki Wolfkill. He attempted to make a Halo play on it such as kill, kill, and rape, as is the typical Halo babble online nowadays, unfortunately. Well, not just Halo, but CoD, and any other FPS nowadays, sadly. Like I said, I'm not down with that type of immature slang, but it's clear to me he wasn't attempting to direct anything sexual at her.
Anyway, just sayin'.