I still think the problem is that people just simply aren't used to seeing taller women and when they do meet the taller ladies they have a tendency to lie about their body weight because they're embarrassed. 
A 6"0 21 year old 60kg lady would have a BMI of 17.9 which is medically underweight. The person who expected this was told by a fashion model that it's how much women should weigh. Fashion models are, of course, frequently of an unhealthy weight. Now it's fine if that's what gets you off; however for many women in real life they would start to become ill consistently being at that weight.
I weigh 63.50kg and have a BMI of 18.9. A healthy BMI starts at 18.5 and ends at 25. As you can see, I have a LOT of scope there before I'm considered overweight in the medical sense of the word. I'm a dress size 6 in US sizing and I've been scouted by modelling agencies on the street. I never say yes because I know it would be expected of me to lose weight and possibly cut my hair off. 
BMI healthy weight calculator - Health tools - NHS Choices
The thing is, I've been both overweight and underweight before. I was ridiculed at school, beaten to the point of broken limbs, concussions and stays in hospital because I was tall and slightly overweight. I stopped eating: every day I just wanted to die because I found myself believing that I was truly worthless. I found myself making excuses not to eat until one day my family could see through my baggy clothes and took me to hospital. Nobody used the word anorexia and my family talked to me about it as I had a throat infection but it was gone now and I needed to eat. For months I would retch up pieces of toast because I just couldn't keep it in. I stayed underweight for a long time; my bones were on display, I wanted to be smaller, so ashamed of my height, too embarrassed to tell people what I weigh. 
Now I'm a healthy weight because I try to eat right and exercise. I'm still at the very lower end and I'm always cautious to keep it that way. That's why that thread upset me so much. Tastes are subjective, yet, and I'm aware this sounds conceited, I'm attractive. I've worked damned hard to be happy within myself, to look in the mirror and not see an overweight woman or an ugly face. I KNOW that I'm a good weight - I still get called skinny, slender, bony, small, by people who don't even know me. I know that I'm attractive - why else would men stare after me in the street, make lewd comments, ask me out all the time? Yet when I hear something nasty it just tears me down again.
I never for a second imagined I'd get the ridicule all over again, especially on this site which seems otherwise so nice and accepting. The truth of the matter is this is that my figure looks like this:
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This notion comes from a society where tiny underweight models are made to look tiny and healthy through the use of our good friend Photoshop:
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Now, if one more person on here says I'm overweight I swear to whatever deity or science that they believe in I will hunt them down. Got it?