Harassment Incident in NW Washington, DC

One day I was walking from lunch take out in NW Washington, DC near I street where it jumps to K and there’s a park. To my right I immediately saw an overweight black and greasy male who was likely a bum take a few steps towards me, likely to grab or rob me. I quickly walk faster and to the left of a white male. The white guy must’ve assumed I ran from someone or something; he turned and did this puff out your chest and took a harsh step towards the black bum who quickly turned around and began walking in the opposite direction.