I am going to tell you the real problem that these people have. It is not the fanservice, you will see that they like the fanservice (that caters to them, normally yaoi or bishojo boys) if you look at their likes.

The problem they have is their own narcissism. They want shows that cater to them and only them, but they don't know (and don't want to know) how to Google. They're mad because what it's popular it's not the thing for them and they only know how to consume what it's popular, they aren't teens anymore so of course they're mad, they can't comprehend anything if the thing isn't a perfect reflection of themselves.

That's why you see them complaining about these animes but not about how YA literature is consuming the shelves, because that's for them do of course it's not a problem.

But the anime that becomes popular in the west is the one catering to teens and people who like the high school dream, not the eternally mad young adult wasting they're live away in a degree they aren't gonna use with a debt they cannot pay. So, again, of course they're mad lol.

There's also the problem that this is for men (I'm a woman and I think Dress up is a good show for everyone honestly, the characters are just too good) and anything that caters to men is bad in today's world.