I just did it with a vipscript:

Code:
raw 319:*:{
  if (%vipcheck) {
    var %vipchan = @/+#badchannel
    if ($istok($3-,%vipchan,32)) { mode %vipopchan +b $address($2,1)
    kick %vipopchan %vipnick You are not welcome here tbh! }
  }
  unset %vip*
}

on *:join:#chan: {
  set %vipcheck $true
  set %vipopchan $chan
  set %vipnick $nick
  whois $nick
}