I left a comment to let the author know that I felt like he was being unnecessarily rude, but I tried very hard to make sure that my own response was civil and professional, and I think it was.
My comment was deleted, though, citing the Be Nice rule, while the answer that I felt was actually rude wasn't edited to change its condescending tone. I agree 100% with the Be Nice rule, and I feel like my response was in line with it. I also feel like the answer I was replying to definitely violated it.
So, I'm genuinely surprised and confused as to what it was about my comment that violated the rule, and why the answer doesn't violate the rule.
I don't see a way for me to retrieve the comment, in order to post it here for others to critique, but maybe one of the mods is able to do that? If there was something rude about my response, I'd genuinely like to know, so that I can try to communicate better in the future.