A stylish insult can spice up a brawl - or start one - and if you find yourself short of anything that can be repeated in polite company (which, I trust, includes your gaming companions even if their characters are somewhat rougher), you may find this handy list useful.
"You villainous, ignorant son of a lobster!" has a certain ring to it, has it not? Or perhaps you prefer to label your target as "You vicious, pestilent latrine stain!"
Naturally, if you read them through all at once there's a certain sameness to them, but they do have some of the inventive flavour of real mediaeval insults, which rarely resorted to the 'F-word' and other examples of foul-mouthed speech common today.
A little bit of fun...