Life would certainly be easier if I could boil everything down to "RACIST!!" or "NOT RACIST!"

But it doesn't help you to learn or understand much about the world.

Puerto rico is very poor. Puerto rico is on an island. Puerto rico's infrastructure has been crumbling and neglected for decades. 1 million people were without power PRIOR to Maria. Local government in Puerto rico is very corrupt/wasteful. Puerto rico got hit by 2 of the worst hurricanes in it's entire history.

All of these things contribute to where Puerto Rico is today. You'll notice that "RACISM!" isn't even on the list. 

There's plenty of aid sitting in puerto rico. The military has been there since day 1. The island is still littered with mudslides and fallen trees, making travel to the central areas extremely difficult.

Working to clear roads and rebuild infrastructure doesn't happen overnight, especially on an island.