When you're roleplaying in Bonfire Island, the chat gets spammed by so many roleplay posts, chit-chat, and other stuff that they probably didn't see what you wrote down. Chances are they weren't intentionally ignoring you, but just didn't see what you posted. Not only that, Bonfire can get pretty laggy, and contributes to posts being missed. I wouldn't take it so personal.
However, if something like this was happening in a not so crowded place and they weren't responding to your posts, chances are they are intentionally ignoring you.