I think growing up in a strongly Roman Catholic household, I would listen to people pass judgment on others, so it was my gut reaction to do the same. I've mostly switched over now to the "it's none of my business" train of thought.

And yeah, non-con was the only kink I enjoy in fandom that I could think of that I don't approve of in RL, but now that you mention it, I have read some chan in the past, and I definitely can't be ok with that in RL either.