Seeing too much of my neighbor

So my downstairs neighbor, a very well-fed gentleman in his 60's, has taken to hanging out in his underwear. I guess it's too hot for clothing or something.

I've never been very comfortable with him to begin with, because he hits on me and tells me how he sees my comings and goings every time I see him. I also can only understand about a quarter of what he's saying because he has a really thick accent.

So on Saturday I went into our building's laundry room and he was sitting in there in his underwear and he started hollering at me. I *think* he felt like I was taking more time with one of the dryers than I should, but it was hard to make out what he was saying. Plus I was trying not to look at him. I think he thought we were just having a conversation, but he was practically shouting, and I was beyond uncomfortable. I ended up grabbing my wet laundry and bolting.

He seems fairly harmless, but still -- now that he's all Captain Underpants all the time, it's becoming a little creepy.

I would just complain to building management, except that our building management is a bunch of idiots. Plus -- get this -- he WORKS for building management. So I really don't trust them to not tell him who complained, which just seems like it would cause more problems.

I have no idea what to do. Any suggestions?