Video shows a neighbor, Karen, blocking the building entrance and refusing to let a black resident into his own home just because of his skin color. >> I live here and you're blocking the door. >> What unit? >> I don't need to tell you that. What unit do you live in? >> 307. >> Okay. I'm on the fourth floor. Excuse me. >> No. >> Ma'am, you're not security. You're not the property manager. You're not Mike Herman. >> But I live here. >> Okay. And I live here, too. You're not Mike Herman. And I've already buzzed in. I've already >> Oh, man. It does not even matter. Can you get out of my way? >> No. Can you show me the key? >> I'm not showing you anything in a second, man. I'm bound to walk through where I live outside. So, >> no. No. >> Excuse me. >> No. >> Excuse me. >> Are you kidding me? >> She keeps following him, convinced he doesn't live there until he calmly opens his own front door. >> You just follow me all the way to my door. >> As a plane, >> hey, you see my keys in the door. >> As a record, I just want to say thanks, ma'am. How about you? >> Have a good night, ma'am. That don't ever do that again. You look pretty stupid on video. And my name is Mr. nose.