Social scientists often celebrate the diversity of cultures and languages in the world, because taken overall/comparatively, this diversity resists the negative aspects of globalization (e.g., corporate conglomeration and monopolization, the colonialistic imposition of wealthier or larger cultures on smaller or poorer ones, etc.) and offers a wide variety of ways of thinking about life.
However, most people are not social scientists; for most people, culture means ignorance. Most people don’t travel very far from home except perhaps for a very brief vacation or pilgrimage, just do a socially acceptable job, marry within their ethnic group and possibly social class, watch their people’s TV and movies, listen to their people’s music, speak their people’s language (thinking in terms of only one worldview, using words other groups can’t understand, etc.), eat their people’s food… and generally ignore or resist other societies and the natural world beyond their people’s territory.
People’s lives are small and brief, languages and cultures are complex and time-consuming to learn (sticking with the one you were raised with is easiest), and culture and language are tied up with people’s senses of self/identity. Culture+language is perhaps humanity’s most basic echo chamber, and most people seem trapped within one or two cultures, unable or unwilling to view their own existence differently.