There will always be trolls out there on the internet. They're usually just like infants seeking attention. That being said, such behavior should reach the admins so they at least can decide on what to do with such a troll. If her/his account is deleted, it's not impossible she/he will be back with a new account unless the admins can mask her/his ip address or something. For you, once you've reported a thing like this, it's best just to ignore it and move on. It'll just wear you down being emotional about it. Wish you all the best! :)