I notice this too a LOT. And I don't get it, tho I do think about it, and it's not something that makes me feel too good.

I am not sure it is because of the bipolar in my case tho, and I can only speak for me cause I don't really know about anyone else. But I am not usually outwardly in a bad mood, I am pretty clam and mild on the surface. However I only think that is why I don't assume it's the bipolar for me. I think that I am a highly sensitive person. I am highly empathetic, sympathetic, my senses seem to be a bit spidy. And then I find myself dumbfound when others do not respond in the a similar manor. So sometimes I just wonder if that is why this happens.

Either maybe they are not as empathetic, don't pick up on as much subtleties, maybe they are not as emotionally or as environmentally aware. Which is not really a bad thing, just different. Sometimes being highly sensitive isn't so great either. I will forever be mistaken for shy introvert, and feel overwhelmed by this world.

I suspect many people with bipolar also are HSP - hehe ya I am using a label, well short hand not really label, there actually is one. Bipolar and HSP do share some traits, so I can see how these traits might be part of this situation. However it does make me feel neglected.

Just my theory.