Some players on Mac client can't/dont know how to use the CRZ Exploit.. Download a program called Littlesnitch (Little Snitch - Download - Trial Client)
This is basically Windows Firewall config but on a mac, this allows you to block the I.P's on a mac client.
First post & not an exploit as such, but I know how it feels to play on an unpopular OS and it can be a pain in the ass to do some things