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

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.