I don't care at all that people disagree with me. I already know you disagree with me. I don't really care, frankly, that people even agree with me: There's no statement so egregiously wrong that someone won't enthusiastically agree. (I am interested if I actually changed your mind on some point, or at least clarified your thinking.)
If Paul Krugman himself were to come here and say only, "Larry, I have a Ph.D in economics, and I say you just don't know what the fuck you're talking about," I wouldn't be interested. (Of course, the good doctor is not a jackass; if he cared enough to comment, he'd care enough to post a devastating (and probably correct) argument showing precisely why I didn't know what the fuck I was talking about, and I would change my mind.)
I don't really care about your personal experiences. I don't care that you live in a communist country and you therefore know communism sucks. I don't care that you used to be an atheist and you now know that God exists. I don't know you, I don't want to know you, and I can't place your personal experiences in enough context to draw any conclusions. Maybe you're just the sort of greedy asshole that's just not going to thrive in a communist country. Maybe you were an atheist for all the wrong reasons, and now you're a theist for all the same wrong reasons. Maybe you just hate borscht. Or maybe not: I don't know and I'm not going to do the work to find out.
I don't care about your criticism — however elaborate — of what you think I believe, or what you think I ought to believe. Seriously: a huge chunk of the criticism I get for calling myself an atheist and a communist (and don't even get me started on philosophy) addresses beliefs and opinions I've never expressed and some I've explicitly denied. I've written a couple hundred thousand words on this blog: It's trivially easy to find something I've actually written to criticize.