Criticizing shitty writing is considered "being super cynical" to you? It's fine if you like the movie, but come on. If they had set up Holtzmann as anything more than "wacky cartoon character" before that point, I wouldn't have had a problem with it. If anyone should have delivered such a speech it's Wiig's character, who actually did seem to undergo some personal growth by joining the group.
Even Wiig's character was annoying though. But Mckinnon and McCarthy's characters were by far the worst.
I also have no idea why the villian turned into a cartoon ghost. Shame this movie wasn't funny and was a poor film.