Nah honestly i'm surprised she doesn't complain more. She put years of work into HH and HB, using ideas she's had since childhood. Unfortunately for her, the subjects of her universe land her squarely in the crosshairs of two of the largest, most obnoxious groups on the internet
Fundie Christians don't like her because duh, her show is literally about HELL. There's millions of helicopter parents on the web who would get offended at the mere notion of her show, but the fact that it was trending for weeks put it square in their faces... and the faces of their oh so precious crotch goblins. Add the fact that there are several LGBT characters, many of whom openly reference not only their sexuality but sex itself, and it's no wonder that the Karens of the world constantly screech at her on twitter
Then you have the homphobes, legions of neocons and incels who have basically the same complaints of the last group, but focused mostly on the LGBT content. This group also tends to be of younger demographics, and have a larger online presence with which to complain. Twitter and FB, sure, but also reddit, 4chan, discord, etc. Oh, and they are way more likely to complain about furries.
Vivzie isn't correct about one thing, though - no show has ever had the "exact same content" as hers. A series of free, extremely high quality animated features readily available to anyone on youtube. It's got much more explicit sex references than most adult animation, and makes them more often. She's making something daring, provocative, and that's GREAT. But that stuff is provocative for a reason - controversy is unavoidable. She should accept that.
Also unlike a lot of creators, Vivzie's whole ecosystem is online. She's not doing her work in an office surrounded by coworkers. She's online - fundraising online, promoting her work, interacting with the community. For her work, she HAS to do this, and it exposes her to a lot of negativity that many creators can easily ignore