Rather than close or ignore PRs, you should start a dialogue with them. Teach them that the AI is not a person, and if they contribute buggy or low quality code, it’s their responsibility, not the AIs, and ultimately their job on the line.
Another perspective I’ve found to resonate with people is to remind them — if you’re not reviewing the code or passing it through any type of human reasoning to determine its fit to solving the business problem - what value are you adding at all? If you just copy pasta through AI, you might as well not even be in the loop, because it’d be faster for me to do it directly, and have the context of the prompts as well.
This is a step change in our industry and an opportunity to mentor people who are misusing it. If they don’t take it, there are plenty of people who will. I have a feeling that AI will actually separate the wheat from the chaff, because right now, people can hide a lack of understanding and effort because the output speed is so low for everyone. Once those who have no issue with applying critical thinking and debugging to the problem and work well with the business start to leverage AI, it’ll become very obvious who’s left behind.