I disagree since the stigma comes from people who think anyone with an anime pic is automatically racist - which isn’t true, especially since I’ve seen a lot of anime pfps who are normal online. This whole “anime pfp bad” nonsense stems from the anime fandom - especially K-On - somehow being a magnet for the far-right and antisemites of all people. One theory I have is that anime fits well with their reactionary vision of the world similar to 40k.
Now that you mention it, that brand of mindless hate for all things manga and anime do seem to originate from 4chan.