You misspelled Khamenei's name. I corrected it in the original and quoted posts. Since you didn't just drop a character or two and instead transformed the name into a slur, you will do well to not press the point and chicken out now that you have been confronted.
As for why you need to back the hell off, one pretty darn good reason would be that you continue to give strategic relationship threads, which have nothing to do with mullahs or sectarianism, a sectarian colour. You need to understand that every country has a right to its own form of government. If you don't like mullahs governing Iran, tough. If you don't like the Queen being the sovereign of England, ditto. Your personal preferences don't give you any right to be abusive.
Keep your sectarian tilts close to your chest. Put that ugliness where it belongs and don't pollute this forum with it.
sure i have certain problems with iran - yet why the heck you need to threaten me to "back off" about expressing my dismay with their previous behavior is pretty mind boggling - unless its a taboo subject because my gripes are with their political choices, nothing else
and the accusation of sectarianism is mind boggling - there is not an iota of evidence from what i have posted to suggest i am in the anti shia camp - the complete opposite, you have your wires very very crossed, religion is not the motivation here.