[Exxy]

The reason I don't see Ignore ever being a thing:

Chat of Person 1
-P1 says, "Oh hey, P2."
-P2 says, "Hey P1."
-*P3 approaches*
-P2 says, "No, I'm afraid I don't know how to get there."
-LOOC P1: What did they say? Q_Q

Chat of Person 2
-P1 says, "Oh hey, P2."
-P2 says, "Hey P1."
-*P3 approaches*
-P3 says, "Excuse me, but do either of you know how to get to Dormeho?"
-P2 says, "No, I'm afraid I don't know how to get there."
-LOOC P1: What did they say? Q_Q

Chat of Person 3
-*P3 approaches*
-P3 says, "Excuse me, but do either of you know how to get to Dormeho?"
-P2 says, "No, I'm afraid I don't know how to get there."
-LOOC P1: What did they say? Q_Q

Edit: I'm sorry you feel the need to turn off a person being able to communicate with you (whether they're being deliberately malicious with non-serious/borderline-OOC IC Say or you genuinely want them to stop) but instead of making a function that nulls their existence out completely you can always try to talk it out with them and if that fails, request they stop in IC OOC/LOOC, then consult a GM if they refuse to (or God forbid you go to Dev, seriously he's probably too busy trying to juggle umpteen different things at once... seriously though, try getting a GM instead).