Instead, Big Bird's claims (as well as those of anyone else who saw Snuffy) were met with derision and ridicule, as well as some unreasonably arbitrary skepticism, as seen in the following clips:
There are also some really egregious examples from the episode about the New York Marathon but, for reasons that should be obvious, I don't want to do too much searching for videos from that episode.
So that's why it's still a sensitive subject to me. Now you know.
In all fairness, I should say that there is one bad thing that came of Snuffy's becoming a fully acknowledged part the neighborhood: It led--directly or indirectly--to the creation of Snuffy's little sister, Alice. In spite of the fact that she was performed by a former figure skater, Alice was one of the most annoying regular characters ever to appear on the show, in my opinion.
If you have about 20 minutes to spare, you can watch an edited version of the episode in which the adults meet Snuffy for the first time (edited to remove the inserts, preserving the entire street story). Also, for further reading on the episode, click here