A little while back a group of scientists, philosophers and other generally brainy types were asked (by a magazine, IIRC) which idea/concept they thought should be retired - in other words, which idea had had its day and should be got rid of.
My vote would be to try to erase this witless idea that swearing indicates a limited vocabulary, which is in itself - ironically - an incredibly unoriginal idea given the amount of times it's trotted out and parrotted by others. I may not have many strengths but I have a superb vocabulary and can be a half-way decent writer when I put my mind to it. It should be obvious upon even a moment's reflection that a person's vocabulary minus swear words is going to be less than the same person's vocabulary + swear words. That's basic arithmetic.
Any twat can see that.