Why are the Zuckermans and Arables so joyful despite Avery's news In Charlottes Web?

The Zuckermans and Arables are joyful because Wilbur, the pig, has gained fame and recognition due to Charlotte's web and her clever messages. They are also happy because Charlotte's legacy lives on through her offspring, who can continue her legacy of writing messages in the web. Thus, despite Avery's news, the positive impact of Wilbur and Charlotte's friendship outweighs any negativity.