bf says vulgar things about other girls and I don't like it
Well, he obviously doesn't care that it makes you uncomfortable and upset and disgusted with him
He says they're only jokes and i shouldn't take it seriously.
They are NOT jokes. Nobody is laughing. His friends probably think he's a gross ass, just as you do.
Is there any other way to tell him i don't like it
You've been as clear as you can be.
He doesn't care you don't like it.
He enjoys your embarrassment and discomfort.
The best way to show him how much you dislike it is to not be there listening to his disgusting mouth anymore.
Find someone else who understands how to listen and be respectful.