I don't think it's racist. I think it's derived from legitimate generalisations of the industry as deeply sexist, built on sexualisation of children and very heavily geared towards overt sexual depictions of kids.

There's nothing racist about this. Lots of people love Japan and yet say these same things about anime. Most anime fans themselves, including myself, will say such deeply critical things about anime, its community and the industry as a whole.

The bulk of it is a reaction to white western anime fans though, who in each anime community each season take the largest amount of interest in whichever show happens to be the most problematic. When the community itself platforms the most problematic shit and revels in their "removed" holding it as a virtue it is easy to see why people have a very negative outlook on it.