When did the Peanuts characters turn into such snots?

Watching this special is painful. The characters use words like "hate," "ugly," and "stupid." It's too bad the producers felt it necessary to update the dialogue to coincide with this hateful era of humanity where it's no longer cool to be polite and a simple "please" or "thank you" is simply nonexistent.

Peanuts should exist in its own contained world of innocence, free of corruption. This special sours Schultz's creations. Sad.