Some people find insults coarse, base and a sorry excuse for invective from the intellectually feeble. I call those people "bloggers who read the comments section."
But seriously, a good insult is a work of art. If you don't believe me, well, "I do desire we be better strangers," (Shakespeare). You're clearly "one of the numerous and varied legion of dullards, of half-animated abortions..." (Dostoevsky). Apparently, "If your brains were dynamite, there wouldn't be enough to blow your hat off" (Vonnegut).
In music, no one has mastered the insult better than the cunning linguists of rap. They've elevated the barb beyond art and into an all-new Webster's-approved synonym -- "diss." I'd pit today's best rap artists against Billy Shakes or MC Fyodor any day in an insult battle. If you disagree, well, go do something "with no Vaseline, just a match and a little bit of gasoline," (Ice Cube).