If you're talking about my post, that was not the poster to whom I was referring. Pointing out someone's error in front of others is the height of rudeness. If a poster is truly that concerned with another's poster's spelling or grammar mistakes, why not send a PM?
While reading through the thread, I've found:
punctuation marks after phrases
improper use of verb tense
incorrect word usage and form
using a comma instead of a semicolon
run on sentences
improper use of commas
misspelled words
The irony is that some of these were mistakes were made by those who were correcting others.