I've noticed that sometimes Orthodox can get extremely legalistic about the fasting rules. A guy from my former church has no respect for the Orthodox Church, because of an experience he had working with some OO guys. He said how they constantly made a big deal to him about the fast and yet they cursed and swore and lived rather immoral lives, which, he felt totally negated all their efforts to impress him with their stringent fasting rules. Let's remember that people are looking to us and our lives more than we may think.
I agree that if one curses, swears, yells at people, hurts people in various ways - this person is thus NOT fasting, no matter what that person eats or does not eat. Any fast is necessarily abstinence from deliberate sin. Dietary rules come a distant second.
I can't recall the name... one Russian priest once got tired of a woman who wanted to know in all the minute details, just what she can and cannot eat during fast, and said, "ah, you know, eat anything... just don't eat people." ("Всe eшь, людeй нe eшь.")