Nora Charles

It's pretty much as you say: if I declare "The manga/music/movie has flaws but I love it" in face-to-face conversations, many will try to tell me I'm worng and why in great detail, or cast aspersions on my taste in an often obnoxious way so it's much easier to simply say it's a guilty pleasure. It's usually gendered too, with my male friends trying to mansplain to me why I'm wrong and it irritates me enough that I usually don't feel up to defending my position.