Ignore and Notices
If you get a “notice”, xchat puts dashes around the nick sending you the notice. To ignore notices from a particular nick:
/ignore some-nick NOTI
Incidentally, note that folks on irc have identification
nick!ident@host. After issuing that above ignore command, you should get a response like:
some-nick!*@* added to ignore list.
BTW, you can even send someone a notice yourself:
/notice #channel nick: You are being notified.