The only other thing to affect height is nutrition. Assuming the same nutrition, certain ethnicities will trend taller than others. Denying that is just straight stupidity because you can observe the trend just by going outside.

> The only other thing to affect height is nutrition.

And puberty blockers, pituitary gland diseases, and lack of sleep.

…and cutting your legs off.

> Assuming the same nutrition, certain ethnicities will trend taller than others.

See, one thing about statistics is they're not necessarily valid for individuals, because eg not all statistical distributions have any values at their averages.

Saying something is genetically determined is not necessarily the same as saying it's completely genetically determined. And it's not meaningless, because there are things that aren't genetically determined at all, or at least are only genetically determined to such a small amount that they wouldn't be described as being genetically determined.

Nothing is "not genetically determined at all" because part of the causation of every human trait involves you being a human.

But you should be clearer than that about what your theory of causation is.