I get this a lot too. I'd think that I've made a very clear point, just to have a whole boardroom of confused looks and people politely trying to move on to a different subject.
At first I attributed it to people being dumb. But eventually I came to accept that I process information differently from maybe 90% of the population, and what makes sense to me doesn't have to make sense to other people. Also, what I consider a logical, step-by-step explanation could come across as being harsh, impersonal, or show-offy to others. It's frustrating, but once I've accepted that other people are entitled to their own neurology I'm less easily angry.
Also, I learned that when non-Aspies ask a question, they aren't always looking for a detailed answer. Sometimes they just want to know that you acknowledge their existence, or their point of view. Sometimes they just want to know that you know what you're doing. And don't feel obliged to give a real answer all the time. NTs don't play that way. Sometimes question-asking is just a social thing.
Sometimes oral questions and answers really get me because I have a really, really hard time processing aural information. I just have to find ways around it, either by asking people to email me instead, or writing down cheat notes, or finding a couple of stock phrases that people like to hear and just use them a lot.