The movie has a lot of its issues, but my main problems with it don't really overlap with some of the aspects in the OP.
1) Max's whole plot is based on the anxiety he gets when this kid enters his life - a kid that wasn't in the first film and that, by necessity, had to be willed into existence in this one. Neither Ellie Kemper nor her new husband are given anything to do in the film because they're not important in the film. There are whole stretches of the film where the pets are off doing their own thing and you can't help but wonder, "Where the hell are their owners?" It's not that Ellie Kemper is only defined by her motherhood, but rather that
none of the human characters are defined by anything but what their role is in the plot: an old cat lady there is literally just there to drive a car, a circus owner is there to just be evil. Nothing has nuance.
2) The film shows very few other animal parents in the film. In fact, I can't thing of a single other one besides the main couple who, also, are hardly in the film. The film is 95% focused on the animals with the human characters (outside maybe the baby) not having any notable screen time. I don't even know what Ellie Kemper's new husband in this one does, and I think he has maybe like 1 line in the whole film. With the human characters making up so little screen time, it's hard for to personally hold this film any more accountable than other children's films when it comes to human representation.
3) The film does take a very simplistic approach when it comes to Rooster treating Max. While it's iffy for me to equate Max's affliction to that of mental illness, I think it's a fair argument to say that Rooster is very simplistic and reductive in trying to address Max's problem.
But honestly, the film is a piece of shit mostly because it's an unfunny, scattershot mess of dueling storylines and uninspired writing.
Late in the film, Snowball's owner dresses him in a pink princess attire, lipstick included, but just when we might think this is Kevin Hart's way of saying, "Look, I'm not that homophobic; my character is a tough guy but he can also embrace femininity," the bunny rips off the outfit and dons chains, baggy clothes and a hat to rap about how macho he actually is.
This isn't wholly true. At first he's donned in the dress and he looks surprised, but then actually embraces it. It's only a bit later that he trades it for baggy clothes because of the rap he does for the end credits. The pink dress (and Snowball unexpectedly loving the dress) was one joke, and the baggy clothing/rap is a separate joke. One isn't a rejection of the other.
