You must eat and drink with right motives.
I flew on American this week for a family vacation and here is what they told us about masks (no joke):
You may remove your mask for eating and drinking but you may not use eating and drinking as an excuse to remove your mask.
So, any eating and drinking you do on the plane must come from pure motives and be unrelated to mask avoidance. How they can possibly discern the motives you may have for eating and drinking, they didn't disclose.
They have gone completely insane.