I think one may read anything one wants as long as one is willing to take responsibility for how that information affects them. I am very anti-censorship.
Are you including responding to posts as well in the question? (I ask because of the "as long as we are not rude to the other person" and I am not sure how one could be rude to another by simply reading).
I, for example, tend to skip over those I find condescending know it alls or those who insist on telling others what to do. I enjoy seeing other viewpoints when they don't descend into "I am right and you are wrong" sorts of posts.