As gross as guro is, I find gurofags to be far,far more tolerable than lolifags. At least most gurofags seem to "know their place" and usually don't push their disgusting fetish onto others or act as if it's totally normal. If anything they generally keep their degeneracy to themselves. Which is more than what can be said for the average lolicon.
It's possible she did it just to draw attention to her nipple piercings to bait the guy into making a comment/stare at them. People like that will do anything for attention and like to think everyone wants their disgusting asses.