You stated, "follow the science". They were doing exactly that.
How would removing the masks for eating and drinking endanger the strangers around you? You're with your family and friends at a table apart from others. Besides, you do not talk much while eating and drinking so there is very little risk.
In the same vein, posing for a picture has practically no risk at all. Temporarily removing a mask, holding it in your hand, then put it back on. Zero risk.
If you're at a party with your family and friends, you put yourself at risk and that's your choice.
If you want to show how much of a hypocrite he is, I'd need pictures but I prefer videos of him not wearing his mask most of the time around people.