That is ok. And I do disagree with them. If you don't know exactly what you are doing, you are making it very difficult to get all the nutrients you need and your body will suffer.
It is all in your prospective, I saw several articles written by animal rights, or animal cruelty or vegan/vegetarian slant that said broccoli was a great protein. I saw several nutrition sites that said is wasn't a complete protein at all. Vegetarians and those of us that aren't will NEVER agree. ok, I am out. really I am.
Well no, there are plenty of people who aren't vegetarians or vegans who don't "disagree" with it or misunderstand it nutritionally. I have plenty of friends who are meat eaters. Some would like to go veg* but like meat too much, some have no desire to go veg*, none "disagree with" it.
Broccoli contains a lot of protein. It's therefore a good source of protein. It does not contain a complete aa profile, no. That doesn't matter. You don't need every protein to be 'complete,' you get different aas from different sources.
The nutrition profile of a food is more than something like whether it's a complete protein or how much protein or carbs it has. There's fibre, vitamins, minerals, phytonutrients, etc.
No, it is not in any way difficult for vegetarians or vegans to get all the nutrients they need, nor do they have to pay special care (besides that often vegans take a B12 supplement or eat something with it in). It's not hard or complex or requiring of anything much.
I've never met a veg* who pays special attention; I've been one since I was a kid and I've known plenty like me and people who were from birth. It's just not a deal.
If a vegetarian or vegan only ate junk food, then yeah, they'd be nutrient deficient, same as if a meat eater does. Other than that, vegetarians and vegans tend to live longer, have better health profiles, lower incidence of many of the major diseases in this country and don't much think about their diets.
You're completely free to not be one but it's not what you seem to believe.