My main problem with strict dietary rhetoric is that it doesn't acknowledge the benefit of people eating vegan (or whatever) sometimes. Like it's a good thing to get nutrition from diverse sources and there's carryover benefit to the planet when doing this.
I'm not a vegan, but I eat a lot of plant-based meals and when I eat meat, because I eat less of it, it's generally local and ethically-raised. Militant vegans will often turn people from making decisions like this, and I think that's a shame.
I was a vegan for years. And I was careful about trying to get my nutrients. But I needed to eat so much more and I was lowkey tired all the time. When I started eating some meat again I felt ashamed of myself for not living up to the rhetoric. But it's just silly to treat this as an all or nothing type thing. A person eating beans and rice one day and a small amount of beef in a stir fry the next is... not the same as a person eating fried chicken every day, and I don't appreciate when anyone implies it is.