[LES] "anime" as a pejorative is bad for critique and discussion
When people use "it's anime"/"too anime" as an insult they normally mean one or both of these two things
A personal distaste for popular aesthetic styles and design trends in japanese media
A distaste for various story tropes in japanese media that can vary from things like screaming and punching each other or sexualization of women
sometimes it is a case where a person is citing point one as an indication that point two will obviously be present.
I think in general this is bad for actual discussion and critique, because you are not actually vocalizing what you dislike about something you are using a loadbearing word to do the argument for you. You don't go "well it has a popular artstyle so I think that means it'll sexualize young girls" and realize that maybe you are taking a logical leap, or maybe not but at least you'd still be more honest with you and your possible audience about it.