allow me to respond to your wall of text with one of my own.

There really isn't a good answer to this. I had the exact same problem at my last building. It was an old historic building turned into an apartment complex. It was in an area where the street was all obnoxious hipsters, but surrounded on all sides by ghetto. Most of the old tenants from when it was just ghetto had long since left or died, but a few had been grandfathered in so their rents never hit the levels that everybody else was paying.

The guy right across the hall was a slimy, dirty old man. He just had that vibe. Most of the hipsters wouldn't even look at him. I think he saw me as "normal" and would always single me out to talk. The walls are paper thin so he knew when I was out and about. WHen I opened my door, he came out in the hallway to have long conversation that everybody else on the floor could here. Usually about how the actractive Asian women across the hall, who we could all hear having sex regularly, was a dirty stuck up slut. I have no doubt he sat around and got off to it. Its one of the reasons I was always so reluctant to have sexy times with my girlfriend, who I lived with. He skirt around talking about her from time to time. He always seemed like he was about to say something, but then could sense I might drop him. He'd turn it around and tell me to send any of my girlfriends friends his way and make sure they knew how good he was at eating pussy. Then he'd launch into his obnoxious and loud laugh that we all became so accustomed to. I don't have delicate sensibilities. It didn't offend me. It was just so damn cringey. You just wanted to shower after speaking to him, which if his smell is any indication he never felt the same way back.

I sort of felt bad for him when I first moved in and noticed how disregarded he was by all the other tenants. I realized much later it was because you had to disregard him. I'm sure deep down he meant well but he was the most abrasive and unpleasant person to be around, and if you so much as said hi to him he went out of his way to be around you every chance he could.

A few times every summer our power would go out. It was an old building with no AC and every unit had at least 3 window ACs going non stop. The apartments turned into saunas. Once when it happened I had plans to go out to dinner with my gf when she got home. It was hot as fuck so I waited in my car with the AC blasting. When he saw me he invited himself into the passenger seat. Thats kind of when I had enough. I laid into him about it and he pleaded with me about how hot it was inside, and out. He then gave a sob story about how everybody in the building hated him. I just went full honest and told him why. I didn't hold back. He got out of the car and walked back to the door like sad Charlie Brown.

I couldn't even feel bad. People like that don't really give you any other option. You either endure it until you want to scream or you're honest. They don't pick up on all the social cues that normal people give off when they're uncomfortable, running late, or just flat out don't want to be bothered.

I hate to say it, but if any of that sounds like your situation then you probably don't have very many options either. If we was going to pick up on more subtle cues, or get the hint he'd have done it a long time ago. Good luck with that though, I know how it feels to dread coming and going from your own home.