Thankfully, you dont have the ability to choose who visits "your" threads. If this was applied universally, where one could effectively block users from reading threads one had initiated, pretty soon we'd have threads that had 50% less responses. Not to mention being able to KICK one off the thread if you disagreed with their position.
Who said anything about kicking him off, I asked him to voluntarily stay away.
BTW - Thanks for your unsolicited and completely ignorant input. FR needs more thread police.