Is “libturd” a personal insult

I flagged a comment by Obey which IMO was a personal insult: “Cry harder lefturd”.  He has since either modified or deleted and replaced that comment, but added in a later comment that “leftturd” was allowed (http://disq.us/p/2x2h1ks) .  I did screenshot his original comment, but I don’t think I need to paste it here; I just would like clarification.

This certainly seems to be derivative of “libtard”.

What IS NOT allowed at all:

The word “retard” (or any derivative like “libtard” or “contard”) is not allowed on this forum at all.

Note: While “dotard” is not a derivative of “retard” it is still an insult and considered name-calling in Rule #2.

I’d like confirmation on this, please.