Responding to nastiness with more nastiness is the surest way to destroy HN. The way to help is to gently point out that we all need to follow the site guidelines.
Sure, but there are ways to call out behaviour and I don't think we need to descend to "FOAD" types of comments. I wasn't criticising the gist of your comment, just the way it's phrased.
Arguably, this comment wasn't worthy of a response, just a downvote and flag.