Allow me to share a favorite passage from Heinlein's Starship Troopers.
"...He looked at us. "You apes- No, not 'apes'; you don't rate that much. You pitiful mob of sickly monkeys ... you sunken-chested, slack-bellied, drooling refugees from apron strings. In my whole life I never saw such a disgraceful huddle of momma's spoiled little darlings..."
...
He went on and on and I began to forget my goose flesh in hearing him storm. He never once repeated himself and he never used either profanity or obscenity. (I learned later that he saved those for very special occasions, which this wasn't.) But he described our shortcomings, physical, mental, moral, and genetic, in great and insulting detail.
But somehow I was not insulted; I became greatly interested in studying his command of language. I wished that we had had him on our debate team..."
It's clearly possible to thoroughly insult someone without once dipping into profanity. Writers of ages bygone (which is to say, up until Tropic Of Capricorn and Naked Lunch were published) did it all the time.
