Yeah I did say it was an interesting point. Maybe a line should be drawn that only beings with higher levels of awareness have rights.
Of course there's a huge philosophical discussion about what higher levels of awareness really represents. Lets put it this way though (and this is only my definition mind you): it's a difference of a being who's aware it exists and feels subjective pain as opposed to a being which is just a bag of instincts which make it move about... no thinking process whatsoever, except for the basic survival stuff (for instance like spiders who's whole existance is being dictated by their instinctual sense of making webs and always moving from colder to warmer space.)