At times, I can be guilty of this. My thoughts will come and I will speak them before fully thinking them through. I even started a thread vowing to have more meaningful and purposeful conversations (https://forums.psychcentral.com/self...versation.html)
When it is bad, I am sure it is annoying. Taking enough medication helps me with this but I don't always choose to take enough. Though I am not like this all of the time. Sometimes I can even be pleasant to be with, it just takes a bit of effort to keep it in check.