Is there a way to block a drupal user from commenting on your posts?
No there is not. However, you can use your own human ability to ignore others. As an aside, one can interpret the first words of aggression as your own @ https://drupal.org/node/2112419#comment-7976157 ; )
Please do not start multiple topics on a single subject. If you post your thread in the wrong section, you can move it by editing the original post and choosing a different forum.
I will soon be leaving the Drupal forums permanently. To understand why, please see this thread.
Duplicate post was done accidentally. Once the initial post was made drupal showed "This page does not exist" or something similar. Later it showed both, and I commented on the other one it being a duplicate.
Drupal is a registered trademark of Dries Buytaert.