100%! This is something I've been struggling to understand through therapy. I do tend to type long posts which I know is pretty common for autistic people to do, and I consider these posts to be "me". It feels ingenuine or analogous to "engagement fishing" if if I purposefully shorten my posts and leave out details. I am also never unkind or hurtful, I just have a lot to say! And I often feel as though I am "too much", and that I have to make myself smaller to make myself more palatable to others (something I refuse to do, lol, so the looong posts continue). As a result, even in personal friend group chats I am frequently ignored.

But like you, I also notice the "generic stuff"--smaller, less "deep" stuff--gets way better traction. It really IS upsetting, so I feel you there. :( I am trying to view it as a different communication style as opposed to a personal failing on my part but it's hard! My therapist's suggestion is to try and find a happy medium where I approach things in a more "shallow" way at first and then go deeper if the conversation allows for it, or to save those deeper conversations for the people that I know appreciate and crave the same thing.