You provide your best answer in your final question: "How do I deal with this persistent 'academic stalking' while at the same time, not make a 'fuss'?" Don't deal with him and don't make a fuss. You might be interested in the following 2 links:
Troll http://en.wikipedia.org/wiki/Troll_(Internet) and(Internet). http://slash7.com/2006/12/22/vampires(2014, September 25). In Wikipedia, The Free Encyclopedia. Retrieved 07:37, September 28, 2014, from http://en.wikipedia.org/w/index.php?title=Troll_(Internet)&oldid=627020408
Hoy, A. (2014). slash7 with Amy Hoy » Blog Archive » Help Vampires: A Spotter’s Guide. Slash7.com. Retrieved 28 September 2014, from http://slash7.com/2006/12/22/vampires/
Don't waste your time with him.