What's y'all's opinion of ABO universe fics?

I feel like one of the big complaints I always hear from pros is that antis have a problem with ABO fics. This has always confused me because I personally love ABO fics and can't think of any reason that the anti community would hate them. Of course there are creepy and problematic things you can do with an ABO fic, but you can make any fanfiction trope creepy and problematic. There's not anything (that I know of) that's inherently objectionable about ABO fics. Is this a real thing or is it just another stereotype that pros have laid on antis because of the opinions of a few? Like how they say we all harass and dox people when it's just some antis that do that