There have certainly have been a few times on the boards when I did feel like I was personally being judged by shipping Spuffy, (not that I actually take it to heart since people don't actually know me personally.) 🙂
Additionally, any time people use words like "disgusting," "degrading," or "disturbing" to describe a relationship or a character, it's hard not to infer that they don't think highly of those of us who love said pairing. If someone looks down so much on something that they think it is downright disgusting, it's easy to imagine that they'd feel the same way about those who stand behind it.
That's why it makes such a big difference when people use phrases like "In my opinion," "For me," "It's not my thing," or "I just didn't see it," instead. In those cases, I feel that they are truly only referring to the issue at hand and not passing judgment on the person who stands behind it. I think most of the time here on the boards, this is the case.