This snippet will simply private message the person who invited you with a vulgar message, then ignore the person for 30 minutes, then close the PM window. Feel free to adjust the time setting and/or message. Any questions, please notify me. Updates will happen :)

ON !*:INVITE:#: {
  query $nick 11,1No bitch I do not want to join your cock sucking club. 8,1I will now ignore you for6,1 30 8,1minutes14,1. 12,1Thank you, and have a nice fucking day14,1!
  ignore -u1800 $wildsite
  window -c $nick
}