The whole killing girlfriend thing is not so cool. I would remove those pieces, they don't add much to the story.
I can remember being made to feel uncomfortable and quite unwelcome upon witnessing a renowned female* developer and entrepreneur joke about killing a group of men who had offered advice on suitable materials for makeshift bottle openers.
* Or "chick" shudder, if we're accepting that "dude" is holding the appropriate tone for this conversation.