Yes, I have been offended by a topic, but It depends on the topic as to whether or not I'll let the person know. Probably, if the topic was about adoption, infertility, or something personal like that, I would leave the person a comment.
I can't say that i've been 'offended' but i've had differing ideas on the subject. I may or may not comment, but realize that everyone has their opinions on things. Things like of the nature Lindsay mentioned is in huge poor taste and that would turn me off big time.
I haven't been, yet. But, it'd take a lot to really offend me. If it was something along the lines of what Lindsay posted, yea I wouldn't go back. But if it was simply a difference of political views or personal things, I would give 'em a second chance.
I'm sure i have been but nothing specific is coming to mind. I am a Wiccan Libertarian and its October, getting close to Halloween and right before an election. The odds of my coming across something I could find offensive religiously or politically are pretty high right now. But I know that, so I deliberately choose not to be offended by things said in passion or ignorance.
I might chime in with my own point of view or not. If it's a blog I read regularly I am unlikely to stop just for one or two posts I don't like. If it's someplace new & I find no compelling reason to return, I won't
I was offended one time over at johncow.com. He used the "C" word and I thought it was extremely distasteful. I told him how I felt and that was that. No hard feelings...I still enjoy him, his blog, and his woman's blog.