On the one extreme of the spectrum are those who believe simultaneously that (a) blogs should not post anything that might offend them, even if they are only visiting a given blog on a first-time fly-by and (b) that anything should be allowed in the comment threads, up to and including insulting the blog owner and his or her other commenters. I call this the "The World Exists to Serve Me" contingent.
On the other extreme are those who believe that (a) blog owners can say whatever the hell they want, however they want, and if the people visiting the blog don't like it, they can go away (common rallying cry, "No one's making you read this blog") and (b) blog owners can do whatever they want with regards to their comments threads -- ban randomly, edit comments according to their own whims, refuse to have any comments, ban people who disagree with them, etc. I call this "It's My Blog and I Can Do What I Want" crowd.
This is one thing that I think proves challenging to a lot of people new to the blogosphere (as well as a few tone-deaf old hands). The blogosphere is not a uniform, homogenous place, operating according to universal rules and expectations. (My god, how boring it would be if that were so.) Instead, the blogosphere varies with the whims and inclinations of each blog host and each commenting community. Some places are fine with profanity, others aren't. Some specialize in trading witty one-offs; others prefer thoughtful, meandering conversations. Some are snarky and sarcastic; some are warm and touchy-feely. Some develop small, close-knit communities into which a newcomer must ease slowly and cautiously; others are big raucous public parties that anyone can jump into without prior experience. The blogosphere is anything but homogenous.
However, to a newcomer, it often looks that way, so the clueless go around bulling their way into existing conversations, committing social faux pas, etc. until someone calls them on it. The honestly clueless wise up, learn to "read the room" and adjust their commenting styles to the norms of each particular blog and its attendent culture.
More at the link...