Until Software Engineers have automated away all the other jobs with AI & software they'll be safe. That's going to take a long time.
Replacing software engineers with AI only affects the bottom line of software companies. Companies are usually fine with increasing the bottom line if they can exponentially increase the top line. I think software engineers will provide that capability for at least the next 10-15 years.
I default to expressing my opinion politely, trying their idea, and if needed reminding them of my idea.
I find this is effective and saves a lot of face. You might learn a few things and/or after a few times where he is wrong and you’re right he (and everyone else) will start to solicit your opinion from the get-go.