It's just more old man yells at cloud bullshit.
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They just can't stand their false gods being challenged by people they see as inferior.
Most people who are Gen-X or older hate anime with a passion, my best guess is that it's too fast paced and it doesn't have enough hostess fruit pie ads.
But Millennials were subject to the "Asian Invasion" of the late 90's and early 2000's; and then the Zoomers and Alphas grew up with anime as standard entertainment. No barrier to entry like finding a Suncoast store that had the right DBZ tapes you needed to find out of Goku and Vegeta kicked Kid Buu's ass or not.
So for Richard, Ethan, and the rest of the crusty old fucks that rage against anime, this is Hell. It doesn't get worse than seeing Superman mogged by a 12 year old with a sword. Their great and glorious Fantastic Four, Marvel's First Family... Completely BTFO'ed by a kid with a sword. They absolutely hate this, it's a revocation of every aspect of their "I'm cool and hip" attitudes, it smashes their megalomania and reminds them that they are---in fact, very out of touch.