Ignore them. Both are inadequate cowards who would never face up to themselves in "real life." I've been called worse than they have ever called me by people who were as far superior to them as I am.

I've often wondered what would happen if the Code Duello was still in force and they might have to answer for their statements with their lives:

"Sir, my friends will call upon you!"
"You ain't got any friends!"

Knock know....

"Hello, my name is Amos, Rapparee's friends. Would you please provide the name of your second so that we might make the proper arrangements? As the challenged party you, of course, have the choice of weapons."

"Whiskey Tango Foxtrot! I didn't mean any of that, I was just kidding around, I was...can't we make this up some other way?"

"I'm afraid not. Now, please, who is acting for you? We really must make the arrangements. And let's follow the American Code, if that's all right with you and your second."