If you descibe someone as an Infernal Iconoclast, you are implying that they are extremely irascible and they are just a thorn in your flesh and the bane of your life.

Origin: Infernal - Very annoying.
Iconoclast- Someone who attacks cherished beliefs or institutions.

So basically you are depicting the person as annoying as a housefly, which always "attacks" you and makes your existence miserable (Infernal & Iconoclast).
Conrad: Do you know what's the most annoying thing in your life? Getting all your hard-earned game data erased because you accidentally uninstalled it!! All beacuse of the Developers!
Belotte: Those Infernal Iconoclasts!
by Hol Up November 28, 2017
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