Yabu - most vegetarians are pretty good at managing a balanced diet for themselves and veggie DC.
Anaemia is rarely due to diet but many GP's are as prejudiced and ignorant as you are. I've had GP's try to blame all sorts of things on my being vegetarian including conditions that pre-date me becoming veggie and which are clearly NOTHING to do with vegetarianism.
Omnivore parents are just as capable of not giving their child a balanced diet.
I've been veggie over 30 years never been anaemic due to diet. Was slightly anaemic after dds birth during which I lost a lot of blood, soon rectified without supplements, without eating meat.
Iron rich veggie foods include dark green leafy veg, legumes (beans, peas, lentils inc tofu made from soy beans), nuts and seeds, quinoa, dark chocolate, egg yolks, fortified breakfast cereals... Tons of ways for a veggie to get enough iron. To enhance absorption vitamin c rich foods taken at the same time helps and not having caffeine which blocks absorption. And this is just as true for omnivores as veggies! My mother - very much an omnivore - has been anaemic several times, won't listen when she's told to cut down on the copious cups of strong tea she drinks daily!
Personally I think the nhs is woefully ill informed on the problems caffeine causes.
"Even if the doctor did say it was a result of not eating red meat (unlikely)" not unlikely in my experience, it's gradually getting better but I've certainly had GP's say that I "should" be eating meat - when pressed it emerges they have little knowledge on vegetarianism! Ie they're talking out their arse!
But I agree it's possible op has made an assumption.
And yes to all those talking about "cutting out a food group" meat is not a food group!
And it's not "rubbish" glintandglide it's entirely possible starzig has only experienced ethical vegetarians - like me!
I don't buy or use leather, silk or wool.