Stop Watching Cops

I am 5'3''. I weigh 95 lbs on a good day. I generally have an upbeat and pleasant disposition. So why are the white folks in my parents' building so afraid of me?!
At least once a week the door is closed on me, and more often than that the elevator is shut in my face. You may be thinking maybe they just don't think I live there, but I grew up here, and for the last 4 years, I ran the local community development center, which is one building over. And! There is only one street here, so everyone knows everyone. Did I mention my mother (who I am a carbon copy of) is a board member of the building's task force committee? And every concierge and maintenance staff member loves me, and greets me by name! So clearly I have not broken into the building. So why are they edging away from me in the elevator or in the hallway? Is there some sort of correlation between melanin and acts of violence or crime that I missed?
Didn't the Obamas teach people anything? People of color can afford to live in nice places, and go to good schools and get groceries at Trader Joe's too. There cannot be a monopoly on that. I think I am going to start gripping my purse when they approach me, and balance the scales a bit. I mean, Ethiopians never bothered anyone! We never executed a slave trade, or any genocides, or world wars. All we did was give the world coffee! I'm the one that should be scared! Historically speaking, I am more likely to be victimized by them than they are of me! Eek, I don't want to get into a racial polemic or anything, I just want to not get grilled when I am going home. Is that asking too much??!