You actually might be surprised what is going on inside, perhaps far more than you suspect. Fingers in the ears implies a willful refusal to listen which is not the same as being unable to hear. The same could apply to a blank stare.
Thats exactly what my daughter does to me....she says(rather shouts) what she has to, and on n on, and when i try n say something, its lalalala with fingers in her ears.
At the risk of looking to defend bad communication or behavior, the point of the "stream of consciousness/download" isn't about an exchange of information or dialogue, it's about bailing water out of the lifeboat. OCPD is an anxiety disorder. When it reaches critical internal levels it has to be externalized or the life raft will sink. At this point I don't think you are going to have an healthy exhange of ideas/information. It's not a rationally based communication, it's a anxiety reduction externalized and projected.
The exchanges that MoreF. is mentioning sound like periodic bailing exercises, preemptive anxiety reduction. The double standard applies to the rules of dialogue. There are two vastly different ways of communicating.
In a way it's like someone learning sign language to communicate with a deaf person. It's learning "anxiety speak". My mother was fluent in it after nearly 60 years with my OCPD dad. Granted it's not an easy language to learn. As mushroom pointed out it can put you at risk personally.
It reminds me of a lady I knew who was born to an american missionary doctor in China. She spent almost 40 years on the mainland and 30 more on Taiwan. In her 90's she broke a hip was in a nursing home. The staff reported she was "delirious and babbling". When a former colleague visited who was fluent in Mandarin, she found she wasn't babbling, she was quoting the Psalms in flawless Chinese.