Revenge in rejecting contributions and deleted comments

TL;DR: What can be done against one user (and his obedient friends) taking revenge on an earnest contributor, and deleting helpful comments?

Stilgart rejected with no feedback, deleted my helpful comment reminding him of Thibaud’s advice “the reason for rejection of this puzzle seems abusive to me. I’m expecting more from high-level members of the community”, and deleted my follow-up comment documenting the deletion. Then he gathered all his friends to reject.

Is this the way we want to treat young new members of the community?

The contribution


I’m closing this temporarily to avoid a flame war. Thibaud will be back tomorrow to address the topic properly.
Let’s all calm down and have a civil discussion then.