Marf, they're just people who enjoy the anonymity of the internet, and take pleasure in making other people react to what they do and say. Just don't reply to them or let them know in any way that they're bothering you, and they won't be a problem. Any reply, even something like "you don't bother me, so just move along =3" is entertaining to them, and will make them want to keep up their game. You just gotta ignore or, if you are able to, delete their comment and forget about it.
Trolls get an especially big kick out of agitating furries because this fandom's members are known for generally being very, VERY defensive (Not every furry is, but a huge majority are). That means when they feel offended or threatened, they lash out in ways where they think they're coming out on top, such as trying to make a point or arguing back, but in reality they're just entertaining the trolls. Moving along without a second glace is the best way to bore them. If only everyone would do this instead of playing their games with them...