Of course, in all these cases, the original sentiments were not totally left behind, a little followed on through and into the thought processes of the mainstream. That's just life. As an old time punk rocker, nothing seemed more wrong than mixing punk and rap, however to the generation after me, who grew up after both had ceased being very specific subgroups, nothing seemed more natural. Whenever you create something, you do so in a world with other people, some of whom may not feel the same way as you do. Well, who are we to go against that since that is probably all we did to being with.
Life goes on.
As for people who first made fun of you only to imitate you later, ignore them. They're most likely not the people you want to hang out with anyway, and they're not likely to contribute anything of their own anyway in the future. Live your life how you want to and you're just going to have to deal with the fact that no matter what you do, there are going to be people who will look down on you for it. I will say that I miss the old days of hardcore, where importance was given to originality. The cool people were typically the ones who thought outside the box, and found new ways to dress and act.