It probably is ADHD, you're right.

When I read your post earlier I felt embarrassed and ashamed. Honestly, I don't want to be a member of this category of people. It makes me sad, frightened, and yes, sometimes disgusted, about myself. I don't understand why people are upvoting this, because I personally would prefer to avoid thinking about things like this. I don't think leaving cereal in your mouth for ten minutes is something funny or endearing or something to commiserate over or support you for, instead it describes something ugly about all of us here that I hate and want to fight against or at least conceal and compensate for as best I can. When I said "it's something particular to you alone", I guess what I meant is that although this would not have happened if you did not have ADHD, many people with ADHD still manage to avoid things such as this. I didn't mean to be hurtful or condemning towards you. Really, I was just trying to defend my own self-image from being damaged. Nothing quite like this has ever happened to me. Repeatedly forgetting what I'm doing is one thing; this is worse. Even if it comes at your expense, I have little enough pride that it's important for me to hold onto it. I don't mean to be unfair or say that this makes you a bad person, but I also don't want to think that it doesn't matter when people do gross things.

I guess overall what I think is that if you are trying to fight against problems like this, that is great and warrants talking about them. I am concerned, however, because sometimes support subreddits like /r/depression and /r/ADHD help people to persist in their bad habits or thought patterns when they should be trying to overcome them. If the reason you mentioned the incident was to help you overcome it in some way, then my feelings on this issue gave me a way off base impression. If you're looking for self-affirmation that things like this don't matter, then I see that as very sad and tragic, although a part of me understands. We should at least aspire to good ideals even if those ideals are unreachable for us, right?