I beg to differ with your opening statement.
You stated that bad language in a lady is vulgar and an indictaion to lack of intelligence, education blah, blah, blah...
So why is it then that a large number of those who might be considered "ladies" by virtue of their ancestry have vocabularies that would shame a sailor?
Besides, nothing feels better than being able to let rip with a stream of invective against fuckwitted snobs.