social justice stuff you see on tumblr is nothing new; these ideas and terminology have been around in activist circles for years. You’re only just finding out about them now because they’ve been brought into the mainstream of a website most of you frequent.
Never be afraid to wear all the bright colors you want. You do not have to stick to the purples, dark blues & blacks because they’re more “suitable” for your dark skin, and bright colors make your dark skin “stand out” too much.
Wear the all the neons, pinks, yellows, bright red, white and anything else you want because your dark skin is beautiful and should flaunt it all you want.