No one seemingly remembers a giant marshmallow man attacking the city and ghosts running wild?

We had COVID running while and a large number of people were pretending it wasn't happening. We have a f'n war going on in Europe and it's treated like little more than some minor annoyance. And that's while they it is happening. People going back to normal after a big event is over and cleaned up is pretty believable, especially when there are no more ghosts floating around.

Also it's not like everybody forgot forever, the people of the city come together at the end for a song.

“the statue of liberty isn’t an action figure. It doesn’t have joints and can’t walk.”

They sprayed it up with slime real well. That's actually a part I really like about Ghostbuster2, all the tools and slime have pretty well established functions. Vigor is also a way more impressive villain than Gozer, which I always found rather unimpressive to say the least.