I'd just walk away, and never speak to them again.
I would probably think they're weird and move on.
I would think they gave me the cold shoulder, and be a tad annoyed, but I'd also be happy that it wasn't worse... I mean maybe they had a HORRIBLE day and needed to yell at someone and they did not yell at me .
Got to take the good with the bad... and not just the bad.
I forgot to mention that they had the complex maintenance men come up to my apartment 3 times and check my apartment & attic because THEY had a fly infestation...the maintenance men found no reason it was my fault. Yet the neighbors still insisted on them investigating. When that died down, they had them come into my apartment to caulk because of an overwhelming scent of smoke coming from my apartment. I live above them and smoke MAYBE 3 cigs a night. They constantly slam their door and it shakes my apartment,; I can feel the vibration. They also leave bags of trash on their "stoop"( it's a shared stoop) and every day it gets closer to my door. When they first moved in, my flowers, lanterns, and planters were mysteriously scattered like never before... And there's more I haven't mentioned. I just don't have the energy to go through all the different items they've left in front of their door and kept edging it closer to my door. Right now its a Christmas wreath. And a garbage bag. Oh and they have a kitchen garbage can dormant on the stoop... Wtf?