English has lots of adjectives and adverbs, so there is no need for foul language when one wants to make a strong point.
What if the strongest point is made using language that you would consider foul?
What do others think about this? Is it proper to object when it happens?
Of course it's not proper. You wouldn't scold your dog for barking at a certain octave. A word is just a sound with meaning. If you dislike the meaning given to a particular sound, then give it your own meaning and move on.
Jon