In scene I of The Glass MenagerieAmanda Winfield makes a comparison between humans and animals in aims to make her son, Tom, have some degree of sophistication at table and not eat his food as wildly as he was.
Her words were:
Animals have sections in their stomachs which enable them to digest flood without mastication, but human beings are supposed to chew their food before they swallow it down.
The response of Tom was to make believe that he had a fork in his hand and made an over-refined motion in a jest. It seems as if Amanda has a pre-conceived notion that all unsophisticated behavior is correlated to being "wild" or "animal-like".