Generally, insults inspire comebacks. Sometimes, the verbally challenged will come back with a physical blow. Sometimes the cerebrally challenged will come back with a lame, "Your mom!"
But for the life of me, I can't figure out how you'd come back from being told you were a "moulting desert ram." I don't even know what it means. So I suspect most people engaging in a battle of wits with an Irish person from the early medieval period would have to slink away in shame.
Not to mention if you were called a "horn of an infertile cow," "son of stammering, surly, puffed-up foreign woman" or "comb of a castrated cockerel, smoky-colored, bent and crooked."
Of course, if you also were an Irish person of the early medieval era, you could whip out some counterattacks. Letting the person who just insulted you know he's a "boiled cow's udder" ought to set him back on his heels a little.