Calling out a business, especially for a service you pay for (ie. a paper), is different from bemoaning spelling/grammar errors on places like chicken forums. It is vastly different from correcting statements made about chickens and their care that are misleading or even dangerously incorrect. Honestly, reading people's spelling/grammar corrections on a forum like this are far more annoying to me than the actual mistake/error could ever hope to be. This is especially true when the person doing the correcting has errors within his or her own writing. Associating spelling/grammar errors with laziness or stupidity leaves a particularly unpleasant taste in my mouth. Of course, people are free to do all of the above. Others are free to quirk a brow in return, or to view such corrections in a less than positive light.
One thing that would be nice to see is a thread that offers helpful grammar lessons and patient guidance for those asking for such guidance within the thread.