Check the case upper and lower letters are correct, then double check the spelling. if that fails try ignoring?, an antagonist who is antagonising for the sake of it, is a sad sad person who does not deserve the mindless attention they trying to provoke, same goes for someone who you just don't get along with, ignore em.
I'll certainly remove any back and forth childish bullshit on my forums and comments section, like I have had to do here, I have no time for it, this is a site for adults, if adults act like kids, they will be banned as kids in good time.