Why are people proud of their language?

Your language is one of the most central and important parts of your culture and background. Your language and the particular dialect or branch of the language you speak can sometimes reveal where you are from, and may indicate some cultural preferences and understandings that are part of your world view. Language serves strongly to create [ironically, unspoken] bonds among people and among nations. There is a great need for caution against forming prejudices against people based on language alone.