Someone PLEASE help me with this

ok, so i was playing in the random arenas, when i eventually lost . After being returned back to the beach area, someone by the name of "Phatty Koo" began whispering curses and insults for no reason, so i attempted to whisper him back to ask him to stop, however it listed him as "not online". I then tried putting him on my ignore list but then received the message "player does not exist" or something along those lines. IS there a program or exploit out there that would allow this, cause its getting quite annoying as hes constantly whispering me every time I log on, nonstop.

p.s. his name is "PHATTY KOO" and hes quite an arrogant player

You can set yourself offline by pressing "N" and then drag down the menu to "offline". Then no one can message you.

When you add him to your ignore list, just make sure you have his name spelled correctly. Some people put all sorts of odd spaces and such in their name to make it difficult to spell.

-Diomedes