Vulgar taste is cheap, but good taste requires, in my opinion, a great deal of exposure and study to develop, and even then also requires "an eye" i.e. innate talent.
There isn't a difference there in my experience. That "eye" is the taste, and before you start studying/practicing/training/doing - most of the time you won't know the "why it works" either. I'm not sure what "vulgar taste" would be.
