Да ну что Вы! Это их так называют в околокультурной тусовке. Причём с неодобрением. А из какого элемента моей формулировки у Вас сложилось противоположное впечатление? Так по-Вашему, есть эквивалент или нет?
It's commonly used as a self-description without any negative meaning implied.
I guess you underestimate the amount of self-conscious irony in our culture. Google "culture vulture" for the amount of culture blogs that use that title. Ex.
http://culturevulturevictoria.com/Of course, technically it has a negative meaning and is also used negatively. Most commonly (in its negative meaning) it describes not someone who's a snob but someone who either pillages other cultures or exploits culture for monetary gain.