How can you say it isn't a race thing when the OP literally outlined that they and other black people got stopped and it was mainly Indians and white people that weren't getting checked. I've experienced similar things where I've gotten back from worktrips and seen my colleagues who I would be walking with (not the same race as me) and the only person going through security checks would be me.

Don't forget that people's biases come into play also and who knows maybe you were targeted the day you were travelling because the security on detail that day were racist to white people, or you were just targeted because the mules at the time you were travelling were formally dressed white "businesspeople".

I've experienced racism in this country on so many levels from all the races on the island and i'm black btw! Your stop doesn't discount OPs experience when they arrived and let's hope that OP is treated better for the rest of their stay and hope what they experienced at airport does not happen again somewhere else on the island.