With such a great cast and director, how do I hate this so movie so much?

Rating: 1/10 (20 February 2020)

Some friends told me this movie was really great and funny. These friends are smart, funny women that I love and respect. So, I tried watching this twice in the hopes I would "get it" and could not get through the whole thing either time. So, maybe in the second half it's actually great and not completely awful, horrible, and excruciating, I couldn't say.
So after my second attempt at watching it (I couldn't get past the diarrhea scene the first time I tried it), I have to ask: how did the guy that did The Office, not to mention the super-talented cast of the principal cast, get involved with this movie? It's just so, so bad. Jon Hamm is even in it, although you'll hate him.
My second attempt got me to about 40 minutes in. I couldn't take any more than that. It's just not funny, and I was really bothered by how horrible the women are towards each other. The humor level is something I would have laughed at when I was 13 (not really), and when it's sad/sentimental, it's just REALLY sad and makes me want to watch something other than this.
In a nutshell, it's like the creators of The Hangover Movies tried to write the women's version but failed. Miserably. Very, very miserably.