Here's why:
* Proper nouns are specific names for people, places, or things. They are always capitalized.
* Common nouns are general names for people, places, or things. They are not capitalized unless they start a sentence.
Examples:
* Proper Noun: Filipinos (refers to a specific group of people)
* Common Noun: people (refers to humans in general)
Therefore, "Filipinos" is the name of a specific group of people and is capitalized, making it a proper noun.