It's a part of HFA where you don't recognise appropriate cues to shut up and listen. I fill space with words because I get uncomfortable with silence and I can only talk from my own point of view because I find it hard to put myself anywhere else, so I try to empathise with what someone says, by likening it to an appropriate thing that happened to me once, but then people say this is wrong and not empathising but draining.
I do try to recall appropriate things to say, how are you is generally my opener for people to talk about their things, but so often they just say fine, and then I'm like....... .... .... and start talking hoping they can join in, but then forgetting it's meant to be a conversation and telling my story. I just about remember now that it's appropriate to make my mother a cup of tea when she comes round to visit, I kind of just expect people to ask or get their own and it never occurs. And mum says she can't feel comfortable at mine because I can't sit still and chat when she visits, that's just my nerves about someone being in my house making me restless.
It can seem rude to people, which is why I don't have a lot of friends. I am only just gaining an understanding of it myself now, so I still find myself having to explain to people about me. Tell me when you want or need something, don't be offended if I don't manage blatant emotion well, if I disappear for weeks at a time I am generally overwhelmed with life and not falling out with you, if I am being a dick, point it out because I probably don't know I am. That sort of thing.
Some people are probably unwittingly the same as I am. I only know about it because my kids are in the process of being diagnosed with similar. I've used forums for years as a sort of go to as it's the only way I can come across as me with my humour and understanding of things, without the weird moments and awkward pauses. And even then sometimes I am not convinced, lol.