"If you'll be so kind as to wait right here you might have an easier time with my grandmother. --- No? That's fine, she's not available anyway."
"Word around town is your mother's just like a horse ... guys are hopping on and off her all day long."
"Simpleton! It's not 'feint, stumble, thrust.' It's more like 'feint, spin, mop your brow, pierce the heart.'" <Then demonstrate.>
"If you prefer not to lose too much blood I can switch to my wooden training sword."
Of course, all this is particularly more poignant after you have dealt a good blow. Timing is eveything, afterall. Additionally, actions speak louder than words some times. It might be most offending to fight with your weapon in one hand and a handkercheif in the other to mop your brow. Or hold some food in your off hand and taunt them while fighting and eating at the same time.
durin
P.S. My apologies to anyone offended by the mother joke.