The 22-year-old shared her experience on Twitter Friday evening.
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"A security guard tailed me on my walk home tonight. He demanded if I lived there because 'you look suspicious.' I showed my keys & buzzed myself into my building. He left, no apology. This is the reality of black girls: One day you're called an icon, the next day, a threat," she wrote.
LA poet Amanda Gorman, 22, recites 'The Hill We Climb' at inauguration ceremony
LA poet Amanda Gorman, 22, recites 'The Hill We Climb' at inauguration ceremony
Shortly after that tweet, Gorman reflected on her encounter with the guard.
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"In a sense, he was right. I AM A THREAT: a threat to injustice, to inequality, to ignorance," she wrote in a separate tweet. "Anyone who speaks the truth and walks with hope is an obvious and fatal danger to the powers that be."
Gorman made history as the youngest inaugural poet when she took the stage Jan. 20 to recite her original poem, "The Hill We Climb." In the poem, she speaks openly about racial injustice in the country.
MORE: Amanda Gorman, in a first, brings poetry to Super Bowl
ABC News contributed to this report.