i think a part of it is true but what null really hate is maybe not anime in of itself, but the people who watch it. i have watched anime since i was a boy but even i could tell back than that the fanbase of most shows are the biggest fucktards on the internet and its gotten worse over the years.
hell, there is a thread on this very site were null calls android 18 from dragon ball z, his waifu (the post is almost 10 years old and i suppose it was posted as a joke)