My coworker's AI responses are driving me insane

I'd speak up. It's disrespectful, it's lazy, and it's very probably deceptive. I'd speak privately to them and if it continues and you don't agree to their reasoning to continue, Cc their manager and HR.

Of course this is high risk. For a working relationship, for your own longevity in the company. But, so is the loss of mutuality. And if the company wants what they are doing, you are so far out of alignment the signal to leave will be strong.

I do think it starts with questioning their behaviour one on one, privately. And listening to their response, and reflecting on it: you may not have all the information: what if they are operating under instruction?

If you do talk, try to keep your temper under control. Avoid giving signals which could be misinterpreted or used against you.

Ask. Not about them. Ask as you would ask if you were interested in using AI the same way. “What are our company standards and expectations around the use of AI for X?” “What editing are we expected to do?”

That should give you a better sense of what sort of reception an intervention should get, or whether anyone besides you perceives this as problematic in the first place.

Is he a coworker or an imaginary coworker you made up just to be able to post this question? (not a trick question, I am performing a geniuine inquiry).

I wish I had a solution for this. One of my friends has taken to copypasting genAI crap in our chats these days, and nobody can figure out how to make him stop. All the rest of us can do is to ignore him when he does this. Nobody cares what genAI has to say about anything, we care about what he has to say.