Hmm... I think there's a qualitiative difference between paying critical attention to quality/consistancy/characterization/storytelling and criticism based on idealogy. Lots of fans will cheerfully admit that the thing they're fannish about is, well, not actually very good, but far fewer people want to discuss whether it's problematic/[x]-ist/Wrong.

You don't have to feel guilty for loving something that's riddled with continuity errors, whereas there can be a "enjoying this makes you a bad person!/By judging this I also judge you!" vibe to social/political criticism (ex: the way women often get criticized for reading romance novels: "How can you read something so riddled with sexist and heteronormative gender assumptions? You're a bad feminist/being complicit in your own oppression!")