Data centers in the USA use less than a fraction of a percent of the water that's used for agriculture.
I'll start worrying about competition with water for food production when that value goes up by a multiple of about 1000.
The US will never give up on eating meat. Full stop.
For every vegan/vegetarian in the US there are probably 25 people that feed beef products to their pets on a daily basis.
The US never gave up eating lobster either, but many here have never had lobster and almost nobody has lobster even once a week. It's a luxury which used to be a staple.
Also, while I'm vegetarian going on vegan, welfare arguments are obviously not relevant in response to an assertation that Americans aren't going to give up meat, because if animal welfare was relevant then Americans would give up meat.
But their point does disarm the suggestion that water consumption for AI is bad because it's just for fun while meat feeds people.
Because when you eat meat, you could have eaten something far less resource intensive like tempeh. But you ate meat for reasons beyond survival. For most of us, it's because we like the taste and we're used to it.
I don't see that as having any stronger of a claim to water consumption than the things we use AI for (fun, getting work done, writing nix/k8s config) much less a claim to many times the amount of water consumption than AI data centers.
I don't see any signs that the US is going to give up on AI and data centers, either. (The coming AI winter notwithstanding)
For what it's worth, I've cut back quite a bit on my beef and pork consumption, and now mostly eat chicken. The environmental and ethical arguments finally got to me.
Also a lot less meat in general. A huge part of our agriculture is feed to feed our food. We need some meat, but the current amount is excessive