unfortunately it's not as easy as saying it might be able to be done by by doing it way X. my sister was constantly offended by my intended to be constructive criticism of her cooking, and usually it was a simple as this would be better if you used more salt. I never said it was bad, I merely suggested how things could be improved, and she took this as an insult, and a complaint.

I find that people don't like criticism period, doesn't matter what, you are criticizing or why. They see it as A, complaining, B insulting, C plain negativity.