You can get these at a carnival, or the variety store... you know what I'm talking about, those little straw tubes, you slip a pinky into each end. IF you try to pull out, it just tightens up, no go. You can't get the fingers out because the harder you pull, the skinnier the tube gets and the more you're trapped. Instead, here's the genius part...you have to push in, the tube scrunches up and gets wider, and bingo, your pinkies are free.
It's like that with the eyerolling inlaws. Don't resist, go with.
YOU: Pass the broccoli
In Laws: You really need to be careful of anemia,
YOU: I know, I know, you're so right.
The key to this is to say it while you are shoveling in the broccoli. Under no circumstances use sarcasm. Drip with sincerity. After a few times, they'll stop mentioning it. Trust me.