The issue is the misuse of the term "heritable" to mean "genetically determined". Toe count is genetically determined; virtually all people are coded for 10 toes. But they have very low heritability: variance in toes is environmental. Conversely: dress-wearing isn't at all genetically determined; anyone can put a dress on. But dress-wearing is highly heritable: the variance is (almost) entirely due to genetic differences.