I would like to suggest something.
You need two for the battle, so please, ignore troll. If she/he has no one to argue with I hope this sad insulting would stop!
no matter how many people say to ignore it, and it will stop, most of the time, they stop, but not because they are ignored. (they never get ignored, people here and on other sites like to play with them). Most that are bothered by it, report it or don't read it. Sorry this is bothersome to you. I've been here longer than most, this is a cycle and it will run it's course.Ogram is right it is a cycle they come and then they go for awhile and return under a different name. You are right ignore them however it is too tempting to respond when they hit a nerve and I am guilty of that myself.