Answer:
There are many legacies of the Gothic subculture. But I think one that most answers the question would be that Gothic people get ostracized quite often and most people like the idea of being outside the box if you will. Therefore, these themes have "staying power" because people today still like to feel different. That's why saying "I'm not like other girls" is such a trend, because nobody wants to be like everyone else, and in doing so, they are like everyone else in feeling that way.
Explanation:
