(Saw this tweet on a queer Facebook page and decided to rewrite it.)
How the lack of mental flexibility and spontaneity in people without ADHD may show up in communication:
1) Never interjects their own thoughts to let you know they're listening and taking in what you're saying.
2) Acting overly reserved and not sharing any personal details on anything.
3) Getting stuck in a rut and having a hard time following the natural flow of conversations between different subjects.
4) Getting easily offended and feeling personally attacked when others do not repress emotions as severely as them.
5) Making great efforts to avoid saying what they mean.
6) Deliberately sending risky messages to others (usually inappropriate, confrontational or emotional in nature).
7) Repeating the same things ad nauseam.
8) Asking inappropriate or uncomfortable questions in group settings, because of getting stuck in their own heads instead of listening.