Across the hall neighbor put his eviction notice on my door. AITAH for pretending to be the police and arresting him?

My across the hall neighbor got an eviction notice posted on his door on Friday. This morning through the peephole I saw him letting in guests, and when he closed the door I saw the paper was gone. I didn’t think too much of it and about a half an hour later I went to let in my own brunch guests— two local artists I’m hoping to commission to paint a mural for my company. When we got to my place, I was shocked to see that my neighbor’s eviction notice was now on my door. I ripped it down and put it back on this door, then reassured the artists that I was not being evicted, and that my neighbor had done what the younger people at my office call a “dick move.” I could tell they didn’t believe me, and brunch was very awkward for me.

After I walked my guests out, I went back into my room and put on a park ranger suit I had from some volunteer work I did a few years back, and a Police hat from some college Halloween weekend. I pounded on my neighbors door and yelled “POLICE, OPEN UP.” I heard gasps and the hushed anxious voices of him and his guests. I shouted again “OPEN UP OR I’M KICKING THE DOOR DOWN!” After a few moments, he opened the door. He had tears in his eyes and it took him a second before he recognized me. But there was no relief in his face. I told him if he ever put his eviction notice on my door again, it would be a real cop next time, and his ass would be going to the slammer.

He came by my door after his guests left and was still crying. I let him in and he apologized. He said he was having some guests over that could support him financially in opening a business so he could get back on his feet, but he didn’t want them to know about his eviction because it would make them hesitant to throw money at him. He said he knew I usually slept in til noon on Sundays and was planning on moving the notice back to his door right after his breakfast.

I said, tough luck. He added unnecessary awkwardness into my mural meeting, and I told him we were now even. He spit on me and left. Usually when it gets to the point where you know you are in the right but someone spits on you, you have to ask: am I the asshole here?