It's not just that, it's also culture, it's also method of governance, and even living habits, and hobbies.
For example, a new generation of Tibetans, grew up watching Chinese tv, reading Chinese articles, and joining Chinese communist party. Buying Chinese products, talking to Chinese people and all kinds of things that would shape a person.
What's more, they grew up learning Chinese, they don't speak Indian and don't speak Tibetan much. Yea I know there's not Indian the language, but you get my point.
One thing I really don't want to mention, cause it would sound racist, and get bad rep, but any Tibetan grew up in China would not have a great view on India and that includes Indian Tibetans. Let's not discuss the particulars, but it is what it is.