I think genuine excitement and flipping is great and but putting on a staged retard show just for the sake of being an attention whore is dumb. That said, getting upset about it is stupid too. Do whatever you want.
If Toronto wins game 4 and takes a 3-1 lead in the series I believe that they will win one of the remaining 3 games (probably on home ice).
If Boston wins game 4, ties the series at 2, and takes back home ice, I'm not confident that the Leafs will win 2 of the remaining 3 games.
It's not an irrational take.