LigH, let us step away from the matter of who is in the situation to complain and who isn't, for a moment.
Even though there is little to nothing that can be done about it, there is a problem with "exclusive RPs", wether or not they are held in public areas. As far as I can see, say is and will allways be public, free for everyone to observe and free for everyone to participate as well, and by the pure principle of it, it is meant for participants to communicate. There are other channels, such as "group" "tell" and "guild", which are suited for private conversation, "say" however is not one of them.
I do know very well, that it is tempting to ignore that "blasted n00b", who just wouldn't fit into the RP context right now, however, as long as this "blasted n00b"'s actions are in character you are supposed to take them in character, or, should you really find out that the pure IC reactions of someone else disrupt your RP, rethink wether it is appropriate to RP in a public channel. I know out of first hand, back from the days when I foolishly thought myself a "good roleplayer", to roleplay in say channel, hoping that someone "leet" will come by and join in, however, it is rather foolish to categorize people, without sufficiently knowing them, and further exclude them from the very purpose of this game.
Last but not least, I would like to remind everyone that Roleplaying is a group activity, not a solo experience. You might have thought up some nice storyline, but still it is not "Your Personal Roleplay", but the roleplay of everyone who is or gets involved. Be open-minded, you might actually find something new, and exciting.
-Cyl
Disclaimer
Whenever I used the referrence "you", I did not mean any particular person, but the concerned reader. I did not point my finger to anyone, and I did not try to offend someone.