The other big problem with forums is that it misses out on communicating tone. Person A types something that is misconstrued by person B, who responds, in a way that is meant to be helpful but is further misconstrued by person A, thereby people get upset. It doesn't even have to be both reading it wrong, it only takes one and is rarely deliberate.
It's also true that people don't like to be told that they're doing things wrong. I certainly don't but I'm also pretty thick skinned about getting upset. This is especially true if they've done their best to do right. I suspect the cycling issue is one of the biggest bugbears here, and there have been a few posts from people worrying about whether to stick to the LFS advice or to follow what is said here.